00643naa#a2200193#i#450# EN\INFRA-M\bibl\3065 20250218081124.2 2075-4094 20141105b2014####ek#y0engy0150####ca RUS RU Chemical composition and biological activity of sapropel in the Orenburg region (V. Sol-Iletsk), genetic link with the composition of the sapropel formers Journal article Moscow INFRA-M Academic Publishing LLC. 2014 7 с. Journal article local Fridzon K. Platonov V. Khadartsev Aleksandr zh-szf.ru