00475naa#a2200169#i#450# EN\INFRA-M\bibl\1019 20240914194824.6 1998-0728 20131225b2013####ek#y0engy0150####ca RUS RU Electronic Textbook: Pros and Contras Journal article Moscow INFRA-M Academic Publishing LLC. 2013 6 с. Journal article local Vinogradova Natalya Fedorovna naukaru.ru