00511naa#a2200181#i#450# EN\INFRA-M\bibl\17348 20240522060118.3 2308-4898 20170704b2017####ek#y0engy0150####ca RUS RU The Task And the Construction of the Quadric Journal article Moscow INFRA-M Academic Publishing LLC. 2017 5 с. Journal article local Математика. 51 RUS Girsh A. G. naukaru.ru