00616naa#a2200193#i#450# EN\\bibl\122709 20260602152248.2 2782-6678 20260504b2026####ek#y0engy0150####ca RUS RU Transformation of the Boundaries of the Forest-Steppe Zone: Causes and Consequences Journal article Moscow MIIGAiK 2026 9 с. Journal article local Физическая география. 39.19 grnti Shakirov Rustem Ravilevich Lugovskoy Aleksandr Mihaylovich miigaik.editorum.ru