00564naa#a2200181#i#450# EN\INFRA-M\bibl\23601 20240928144911.6 2308-4898 20181114b2018####ek#y0engy0150####ca RUS RU Synthesis of Equations For Ruled Surfaces With Two Curvilinear And One Rectangular Directrixes Journal article Moscow INFRA-M Academic Publishing LLC. 2018 9 с. Journal article local Математика. 51 RUS Kokareva Ya. A. zh-szf.ru