00550naa#a2200181#i#450# EN\INFRA-M\bibl\23601 20210420162434.2 2308-4898 20181114b2018####ek#y0engy0150####ca RUS RU Synthesis of Equations For Ruled Surfaces With Two Curvilinear And One Rectangular Directrixes Article Moscow INFRA-M Academic Publishing LLC. 2018 9 с. Article local Математика. 51 RUS Kokareva Ya. A. riorpub.com