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 <front>
  <journal-meta>
   <journal-id journal-id-type="publisher-id">Solar-Terrestrial Physics</journal-id>
   <journal-title-group>
    <journal-title xml:lang="en">Solar-Terrestrial Physics</journal-title>
    <trans-title-group xml:lang="ru">
     <trans-title>Solar-Terrestrial Physics</trans-title>
    </trans-title-group>
   </journal-title-group>
   <issn publication-format="online">2500-0535</issn>
  </journal-meta>
  <article-meta>
   <article-id pub-id-type="publisher-id">39461</article-id>
   <article-id pub-id-type="doi">10.12737/stp-63202014</article-id>
   <article-categories>
    <subj-group subj-group-type="toc-heading" xml:lang="ru">
     <subject>Results of current research</subject>
    </subj-group>
    <subj-group subj-group-type="toc-heading" xml:lang="en">
     <subject>Results of current research</subject>
    </subj-group>
    <subj-group>
     <subject>Results of current research</subject>
    </subj-group>
   </article-categories>
   <title-group>
    <article-title xml:lang="en">Observations of space debris in the vicinity of orbits of global navigation satellite systems</article-title>
    <trans-title-group xml:lang="ru">
     <trans-title>Observations of space debris in the vicinity of orbits of global navigation satellite systems</trans-title>
    </trans-title-group>
   </title-group>
   <contrib-group content-type="authors">
    <contrib contrib-type="author">
     <name-alternatives>
      <name xml:lang="ru">
       <surname>Коробцев</surname>
       <given-names>Иван Владимирович</given-names>
      </name>
      <name xml:lang="en">
       <surname>Korobtsev</surname>
       <given-names>Ivan Vladimirovich</given-names>
      </name>
     </name-alternatives>
     <email>korobtsev@yandex.ru</email>
     <xref ref-type="aff" rid="aff-1"/>
    </contrib>
    <contrib contrib-type="author">
     <name-alternatives>
      <name xml:lang="ru">
       <surname>Цуккер</surname>
       <given-names>Татьяна Гариевна</given-names>
      </name>
      <name xml:lang="en">
       <surname>Tsukker</surname>
       <given-names>Tatyana Garrievna</given-names>
      </name>
     </name-alternatives>
     <email>tanya@iszf.irk.ru</email>
     <xref ref-type="aff" rid="aff-2"/>
    </contrib>
    <contrib contrib-type="author">
     <name-alternatives>
      <name xml:lang="ru">
       <surname>Мишина</surname>
       <given-names>Марина Николаевна</given-names>
      </name>
      <name xml:lang="en">
       <surname>Mishina</surname>
       <given-names>Marina Nikolaevna</given-names>
      </name>
     </name-alternatives>
     <email>mmish@iszf.irk.ru</email>
     <xref ref-type="aff" rid="aff-3"/>
    </contrib>
    <contrib contrib-type="author">
     <name-alternatives>
      <name xml:lang="ru">
       <surname>Горяшин</surname>
       <given-names>Владимир Егорович</given-names>
      </name>
      <name xml:lang="en">
       <surname>Goryashin</surname>
       <given-names>Vladimir Egorovich</given-names>
      </name>
     </name-alternatives>
     <email>vgor@iszf.irk.ru</email>
     <xref ref-type="aff" rid="aff-4"/>
    </contrib>
    <contrib contrib-type="author">
     <name-alternatives>
      <name xml:lang="ru">
       <surname>Еселевич</surname>
       <given-names>Максим Викторович</given-names>
      </name>
      <name xml:lang="en">
       <surname>Eselevich</surname>
       <given-names>Maxim Viktorovich</given-names>
      </name>
     </name-alternatives>
     <email>mesel@iszf.irk.ru</email>
     <bio xml:lang="ru">
      <p>кандидат физико-математических наук;</p>
     </bio>
     <bio xml:lang="en">
      <p>candidate of physical and mathematical sciences;</p>
     </bio>
     <xref ref-type="aff" rid="aff-5"/>
    </contrib>
   </contrib-group>
   <aff-alternatives id="aff-1">
    <aff>
     <institution xml:lang="ru">Институт солнечно-земной физики СО РАН</institution>
     <city>Иркутск</city>
     <country>Россия</country>
    </aff>
    <aff>
     <institution xml:lang="en">Institute of Solar Terrestrial Physics SB RAS</institution>
     <city>Irkutsk</city>
     <country>Russian Federation</country>
    </aff>
   </aff-alternatives>
   <aff-alternatives id="aff-2">
    <aff>
     <institution xml:lang="ru">Институт солнечно-земной физики СО РАН</institution>
     <city>Иркутск</city>
     <country>Россия</country>
    </aff>
    <aff>
     <institution xml:lang="en">Institute of Solar-Terrestrial Physics SB RAS</institution>
     <city>Irkutsk</city>
     <country>Russian Federation</country>
    </aff>
   </aff-alternatives>
   <aff-alternatives id="aff-3">
    <aff>
     <institution xml:lang="ru">Институт солнечно-земной физики СО РАН</institution>
     <city>Иркутск</city>
     <country>Россия</country>
    </aff>
    <aff>
     <institution xml:lang="en">Institute of Solar Terrestrial Physics SB RAS</institution>
     <city>Irkutsk</city>
     <country>Russian Federation</country>
    </aff>
   </aff-alternatives>
   <aff-alternatives id="aff-4">
    <aff>
     <institution xml:lang="ru">Институт солнечно-земной физики СО РАН</institution>
     <city>Иркутск</city>
     <country>Россия</country>
    </aff>
    <aff>
     <institution xml:lang="en">Institute of Solar-Terrestrial Physics SB RAS</institution>
     <city>Irkutsk</city>
     <country>Russian Federation</country>
    </aff>
   </aff-alternatives>
   <aff-alternatives id="aff-5">
    <aff>
     <institution xml:lang="ru">Институт солнечно-земной физики СО РАН</institution>
     <city>Иркутск</city>
     <country>Россия</country>
    </aff>
    <aff>
     <institution xml:lang="en">Institute of Solar Terrestrial Physics SB RAS</institution>
     <city>Irkutsk</city>
     <country>Russian Federation</country>
    </aff>
   </aff-alternatives>
   <volume>6</volume>
   <issue>3</issue>
   <fpage>94</fpage>
   <lpage>100</lpage>
   <self-uri xlink:href="https://zh-szf.ru/en/nauka/article/39461/view">https://zh-szf.ru/en/nauka/article/39461/view</self-uri>
   <abstract xml:lang="ru">
    <p>The problem of the amount and characteristics of space debris in the vicinity of orbits of Global Navigation Satellite Systems (GNSS) is of significant interest from the viewpoint of safe operation of these systems. Attempts have repeatedly been made to search for space debris fragments in a given region of orbits, but have not led to cataloging such objects. Only in 2018, eight space objects were discovered which were not related to active or inactive spacecraft or their launch elements. Photometrical and trajectory observations with optical telescopes are practically the only source of information about characteristics of such objects. The paper presents a summary of the design features and technical characteristics of the new AZT-33VM telescope. We describe a technique for determining orbital parameters of non-cataloged space debris from optical measurements. We report the results of photometric observations of a space object, detected in the vicinity of orbits of the Global Navigation Satellite System GLONASS.</p>
   </abstract>
   <trans-abstract xml:lang="en">
    <p>The problem of the amount and characteristics of space debris in the vicinity of orbits of Global Navigation Satellite Systems (GNSS) is of significant interest from the viewpoint of safe operation of these systems. Attempts have repeatedly been made to search for space debris fragments in a given region of orbits, but have not led to cataloging such objects. Only in 2018, eight space objects were discovered which were not related to active or inactive spacecraft or their launch elements. Photometrical and trajectory observations with optical telescopes are practically the only source of information about characteristics of such objects. The paper presents a summary of the design features and technical characteristics of the new AZT-33VM telescope. We describe a technique for determining orbital parameters of non-cataloged space debris from optical measurements. We report the results of photometric observations of a space object, detected in the vicinity of orbits of the Global Navigation Satellite System GLONASS.</p>
   </trans-abstract>
   <kwd-group xml:lang="ru">
    <kwd>space debris</kwd>
    <kwd>Global Navigation Satellite System</kwd>
    <kwd>wide-field telescope</kwd>
   </kwd-group>
   <kwd-group xml:lang="en">
    <kwd>space debris</kwd>
    <kwd>Global Navigation Satellite System</kwd>
    <kwd>wide-field telescope</kwd>
   </kwd-group>
  </article-meta>
 </front>
 <body>
  <p></p>
 </body>
 <back>
  <ref-list>
   <ref id="B1">
    <label>1.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Abalakin V.K., Aksenov E.P., Grebenikov E.A., Demin V.G., Ryabov Yu.A. Spravochnoe rukovodstvo po nebesnoi mekhanike i astrodinamike. Izd. 2 [Reference Guide to Celestial Mechanics and Astrodynamics. 2nd ed.]. Moscow, Nauka Publ., 1976. 273 p. (In Russian).</mixed-citation>
     <mixed-citation xml:lang="en">Abalakin V.K., Aksenov E.P., Grebenikov E.A., Demin V.G., Ryabov Yu.A. Spravochnoe rukovodstvo po nebesnoi mekhanike i astrodinamike. Izd. 2 [Reference Guide to Celestial Mechanics and Astrodynamics. 2nd ed.]. Moscow, Nauka Publ., 1976. 273 p. (In Russian).</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B2">
    <label>2.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Ackermann M.R., Kiziah R.R., Beason J.D., Zimmer P.C., McGraw J.T. Exploration of wide-field optical system technologies for sky survey and space surveillance. Proc. 30th Space Symposium. Colorado Springs, Colorado, USA. 2014, pp. 1-28.</mixed-citation>
     <mixed-citation xml:lang="en">Ackermann M.R., Kiziah R.R., Beason J.D., Zimmer P.C., McGraw J.T. Exploration of wide-field optical system technologies for sky survey and space surveillance. Proc. 30th Space Symposium. Colorado Springs, Colorado, USA. 2014, pp. 1-28.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B3">
    <label>3.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Bordovitsyna T.V., Avdyushev V.A. Teoriya dvizheniya iskusstvennykh sputnikov Zemli. Analiticheskie i chislennye metody. Izd. 2. [The Theory of Motion of Artificial Earth Satellites. Analytical and Numerical Methods. 2nd ed.]. Tomsk, TGU Publ. 2016, 254 p. (In Russian).</mixed-citation>
     <mixed-citation xml:lang="en">Bordovitsyna T.V., Avdyushev V.A. Teoriya dvizheniya iskusstvennykh sputnikov Zemli. Analiticheskie i chislennye metody. Izd. 2. [The Theory of Motion of Artificial Earth Satellites. Analytical and Numerical Methods. 2nd ed.]. Tomsk, TGU Publ. 2016, 254 p. (In Russian).</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B4">
    <label>4.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Chuprakov S.A., Eselevich M.V., Korobtsev I.V. Stray light protection system of the AZT-33VM telescope focal plane, Sayan Astronomical Complex. J. Astronomical Telescopes, Instruments, and Systems. 2018, vol. 4, no. 2, p. 024002. DOI: 10.1117/1.JATIS.4.2.024002.</mixed-citation>
     <mixed-citation xml:lang="en">Chuprakov S.A., Eselevich M.V., Korobtsev I.V. Stray light protection system of the AZT-33VM telescope focal plane, Sayan Astronomical Complex. J. Astronomical Telescopes, Instruments, and Systems. 2018, vol. 4, no. 2, p. 024002. DOI: 10.1117/1.JATIS.4.2.024002.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B5">
    <label>5.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Denisenko S.A., Kamus S.F., Pimenov Yu.D., Tergoev V.I., Papushev P.G. Fast wide-angle telescope AZT-33VM. Opticheskii zhurnal. [J. Optical Technology]. 2009, vol. 79, no. 9, pp. 48-51 (in Russian).</mixed-citation>
     <mixed-citation xml:lang="en">Denisenko S.A., Kamus S.F., Pimenov Yu.D., Tergoev V.I., Papushev P.G. Fast wide-angle telescope AZT-33VM. Opticheskii zhurnal. [J. Optical Technology]. 2009, vol. 79, no. 9, pp. 48-51 (in Russian).</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B6">
    <label>6.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Dick J., Herridge P., Tremayne-Smith R., Davey J., Crowther R. Surveying for debris in MEO with optical sensors. Proc. 5th European Conference on Space Debris, ESA. 2009. vol. 5, iss. 1.</mixed-citation>
     <mixed-citation xml:lang="en">Dick J., Herridge P., Tremayne-Smith R., Davey J., Crowther R. Surveying for debris in MEO with optical sensors. Proc. 5th European Conference on Space Debris, ESA. 2009. vol. 5, iss. 1.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B7">
    <label>7.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Eselevich M.V., Goryashin V.E., Korobtsev I.V., Tsukker T.G. Observations of unknown space debris objects at AZT-33VM telescope. Ekologicheskiy vestnik nauchnykh tsentrov ChES [Ecological Bulletin of Research Centers of the Black Sea Economic Cooperation]. 2017, vol. 4, iss. 3, pp. 52-60. (In Russian). DOI: 10.31429/ vestnik-14-4-3-52-60.</mixed-citation>
     <mixed-citation xml:lang="en">Eselevich M.V., Goryashin V.E., Korobtsev I.V., Tsukker T.G. Observations of unknown space debris objects at AZT-33VM telescope. Ekologicheskiy vestnik nauchnykh tsentrov ChES [Ecological Bulletin of Research Centers of the Black Sea Economic Cooperation]. 2017, vol. 4, iss. 3, pp. 52-60. (In Russian). DOI: 10.31429/ vestnik-14-4-3-52-60.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B8">
    <label>8.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">ESA’s Annual Space Environment Report. 2019. https://www.sdo.esoc.esa.int/environment_report/Space_ Environment_Report_latest.pdf (accessed 20 August 2019).</mixed-citation>
     <mixed-citation xml:lang="en">ESA’s Annual Space Environment Report. 2019. https://www.sdo.esoc.esa.int/environment_report/Space_ Environment_Report_latest.pdf (accessed 20 August 2019).</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B9">
    <label>9.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Everhart E. Implicit single-sequence methods for integrating orbits. Celestial Mechanics. 1974, vol. 10, iss. 1, pp. 35-55. DOI: 10.1007/BF01261877.</mixed-citation>
     <mixed-citation xml:lang="en">Everhart E. Implicit single-sequence methods for integrating orbits. Celestial Mechanics. 1974, vol. 10, iss. 1, pp. 35-55. DOI: 10.1007/BF01261877.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B10">
    <label>10.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Hoots F.R., Roehrich R.L. Models for propagation of NORAD element sets. Spacetrack Report No. 3. Aerospace Defense Center, Peterson AFB, CO. 1988, 90 p.</mixed-citation>
     <mixed-citation xml:lang="en">Hoots F.R., Roehrich R.L. Models for propagation of NORAD element sets. Spacetrack Report No. 3. Aerospace Defense Center, Peterson AFB, CO. 1988, 90 p.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B11">
    <label>11.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Howell S.B. Handbook of CCD Astronomy. Second ed. Cambridge. UK: Cambridge University Press, 2006. 223 p.</mixed-citation>
     <mixed-citation xml:lang="en">Howell S.B. Handbook of CCD Astronomy. Second ed. Cambridge. UK: Cambridge University Press, 2006. 223 p.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B12">
    <label>12.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Kamus S.F., Tergoev V.I., Papushev P.G., Drujinin S.A., Karavaev Y.S., Palachev Y.M., Denisenko S.A., Lipin N.A. Wide range astronomical telescope. Opticheskiy zhurnal [J. Optical Technology]. 2002, vol. 69, no. 9, pp. 84-87. (In Russian).</mixed-citation>
     <mixed-citation xml:lang="en">Kamus S.F., Tergoev V.I., Papushev P.G., Drujinin S.A., Karavaev Y.S., Palachev Y.M., Denisenko S.A., Lipin N.A. Wide range astronomical telescope. Opticheskiy zhurnal [J. Optical Technology]. 2002, vol. 69, no. 9, pp. 84-87. (In Russian).</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B13">
    <label>13.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Kelecy T., Jah M., Sydney P., Kervin P. Analysis of Pan-STARRS photometric and astrometric data for data association and physical consistency assessment. Proc. 6th European Conference on Space Debris. Darmstadt, Germany, 22-25 April 2013 (ESA SP-723), id.28.</mixed-citation>
     <mixed-citation xml:lang="en">Kelecy T., Jah M., Sydney P., Kervin P. Analysis of Pan-STARRS photometric and astrometric data for data association and physical consistency assessment. Proc. 6th European Conference on Space Debris. Darmstadt, Germany, 22-25 April 2013 (ESA SP-723), id.28.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B14">
    <label>14.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Lafler J., Kinman T.D. An RR Lyrae star survey with the Lick 20-inch astrograph II. The calculation of RR Lyrae periods by electronic computer. Astrophys. J. Suppl. 1965, vol. 11, pp. 216. DOI: 10.1086/190116.</mixed-citation>
     <mixed-citation xml:lang="en">Lafler J., Kinman T.D. An RR Lyrae star survey with the Lick 20-inch astrograph II. The calculation of RR Lyrae periods by electronic computer. Astrophys. J. Suppl. 1965, vol. 11, pp. 216. DOI: 10.1086/190116.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B15">
    <label>15.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Mulrooney M., Matney M., Hejduk M., Barker E. An investigation of global albedo values. Proc. Advanced Maui Optical and Space Surveillance Technologies Conference. 2008, p. E65.</mixed-citation>
     <mixed-citation xml:lang="en">Mulrooney M., Matney M., Hejduk M., Barker E. An investigation of global albedo values. Proc. Advanced Maui Optical and Space Surveillance Technologies Conference. 2008, p. E65.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B16">
    <label>16.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">McCue G.A., Williams J.G., Morford J.M. Optical characteristics of artificial satellite. Planetary and Space Sci. 1971, vol. 19, no. 8, pp. 851-868. DOI: 10.1016/0032-0633(71)90137-1.</mixed-citation>
     <mixed-citation xml:lang="en">McCue G.A., Williams J.G., Morford J.M. Optical characteristics of artificial satellite. Planetary and Space Sci. 1971, vol. 19, no. 8, pp. 851-868. DOI: 10.1016/0032-0633(71)90137-1.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B17">
    <label>17.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Newsletters of PJSC “IAC Vympel”. 2019. http://spacedata. vimpel.ru/ru (accessed 10 January 2019).</mixed-citation>
     <mixed-citation xml:lang="en">Newsletters of PJSC “IAC Vympel”. 2019. http://spacedata. vimpel.ru/ru (accessed 10 January 2019).</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B18">
    <label>18.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Schildknecht T. Optical surveys for space debris. Astron. Astrophys. Rev. 2007, vol. 14, pp. 41-111. DOI: 10.1007/ s00159-006-0003-9.</mixed-citation>
     <mixed-citation xml:lang="en">Schildknecht T. Optical surveys for space debris. Astron. Astrophys. Rev. 2007, vol. 14, pp. 41-111. DOI: 10.1007/ s00159-006-0003-9.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B19">
    <label>19.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Schildknecht T., Ploner M., Hugentobler U. The search for debris in GEO. Adv. Space Res. 2001, vol. 28, no. 9, pp. 1291-1299. DOI: 10.1016/S0273-1177(01)00399-4.</mixed-citation>
     <mixed-citation xml:lang="en">Schildknecht T., Ploner M., Hugentobler U. The search for debris in GEO. Adv. Space Res. 2001, vol. 28, no. 9, pp. 1291-1299. DOI: 10.1016/S0273-1177(01)00399-4.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B20">
    <label>20.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Schildknecht T., Vananti A., Herzog J., Hinze A., Krag H., Flohrer T. Optical surveys for space debris in MEO. Proc. 9th US-Russian Space Surveillance Workshop. 2012. Listvyanka (Irkutsk), Russia.</mixed-citation>
     <mixed-citation xml:lang="en">Schildknecht T., Vananti A., Herzog J., Hinze A., Krag H., Flohrer T. Optical surveys for space debris in MEO. Proc. 9th US-Russian Space Surveillance Workshop. 2012. Listvyanka (Irkutsk), Russia.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B21">
    <label>21.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Seitzer P., Smith R., Africano J., Jorgensen K., Stansbery E., Monet D. MODEST observations of space debris at geosynchronous orbit. Adv. Space Res. 2004, vol. 34, iss. 5, pp. 1139-1142. DOI: 10.1016/j.asr.2003.12.009.</mixed-citation>
     <mixed-citation xml:lang="en">Seitzer P., Smith R., Africano J., Jorgensen K., Stansbery E., Monet D. MODEST observations of space debris at geosynchronous orbit. Adv. Space Res. 2004, vol. 34, iss. 5, pp. 1139-1142. DOI: 10.1016/j.asr.2003.12.009.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B22">
    <label>22.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Silha J., Schildknecht T., Hinze A., Flohrer T., Vananti A. An optical survey for space debris on highly eccentric and inclined MEO orbits. Adv. Space Res. 2017, vol. 59, pp. 181-192. DOI: 10.1016/j.asr.2016.08.027.</mixed-citation>
     <mixed-citation xml:lang="en">Silha J., Schildknecht T., Hinze A., Flohrer T., Vananti A. An optical survey for space debris on highly eccentric and inclined MEO orbits. Adv. Space Res. 2017, vol. 59, pp. 181-192. DOI: 10.1016/j.asr.2016.08.027.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B23">
    <label>23.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">URL: http://ckp-rf.ru/ckp/3056/ (accessed 12 March 2019).</mixed-citation>
     <mixed-citation xml:lang="en">URL: http://ckp-rf.ru/ckp/3056/ (accessed 12 March 2019).</mixed-citation>
    </citation-alternatives>
   </ref>
  </ref-list>
 </back>
</article>
