00451naa#a2200169#i#450# EN\INFRA-M\bibl\412 20260317124125.2 2308-4898 20130725b2013####ek#y0engy0150####ca RUS RU On circular orbits of planets Journal article Moscow INFRA-M Academic Publishing LLC. 2013 2 с. Journal article local Boykov Aleksey zh-szf.ru