00479naa#a2200169#i#450# EN\INFRA-M\bibl\4667 20240716021858.2 1998-0728 20141217b2014####ek#y0engy0150####ca RUS RU Unified textbook for comprehensive school? Journal article Moscow INFRA-M Academic Publishing LLC. 2014 4 с. Journal article local Vinogradova Natalya Fedorovna zh-szf.ru