00560naa#a2200169#i#450# EN\\bibl\106695 20251205213605.5 2221-3260 20250930b2025####ek#y0engy0150####ca RU From malthusian fears to reality: to the question of the demographic crisis in modern Russia Journal article Yaroslavl Yaroslavl State Technical University 2025 14 с. Journal article local Alpidovskaya Marina Leonidovna Suchkova Uliana Sergeevna chemintech.ru