00616naa#a2200193#i#450# EN\INFRA-M\bibl\44892 20241125234155.1 2308-4898 20210722b2021####ek#y0engy0150####ca RU Mathematical Description for a Particular Case of Ellipse Focus Quasi-Rotation Around an Elliptical Axis Journal article Moscow INFRA-M Academic Publishing LLC. 2021 6 с. Journal article local Математика. 51 Antonova I. V. Solomonova E. V. Kadykova Nina S. zh-szf.ru