00474naa#a2200169#i#450# EN\INFRA-M\bibl\11404 20260209123649.1 2500-3321 20160325b2016####ek#y0engy0150####ca RUS RU The structure of scientific knowledge and its levels Journal article Moscow INFRA-M Academic Publishing LLC. 2016 0 с. Journal article local Lebedev S. A. zh-szf.ru