00644naa#a2200193#i#450# EN\INFRA-M\bibl\27945 /en/manage/index 20250228212758.5 2306-1731 20190327b2019####ek#y0engy0150####ca RUS RU The Theory of Self-Identification and Categorical Research Method Journal article Moscow INFRA-M Academic Publishing LLC. 2019 8 с. Journal article local Статистика. Демография. Социология. 31 RUS Popey-ool Saida Kuularovna test.editorum.ru /en/manage/index