00617naa#a2200181#i#450# EN\\bibl\113033 20260119035233.1 2311-1402 20121225b2012####ek#y0engy0150####ca RUS RU Classification of criteria used in russian scientific references to single out mesolithic period (till late 80s of XX century) Journal article Nizhnevartovsk Nizhnevartovsk State University 2012 4 с. Journal article local Архелогия. 902 RUS Grebenukov Vladimir Ivanovich vestnik.nvsu.ru