00503naa#a2200181#i#450# EN\INFRA-M\bibl\19048 20210420174405.2 2308-4898 20171213b2017####ek#y0engy0150####ca RUS RU Formation of Cyclic Surfaces in Kinetic Geometry Article Moscow INFRA-M Academic Publishing LLC. 2017 12 с. Article local Математика. 51 RUS Sal'kov N. A. riorpub.com