00598naa#a2200193#i#450# EN\\bibl\98532 20250907185001.7 3034-4689 20250801b2025####ek#y0engy0150####ca RU ANALYSIS OF THE IMPACT OF NATURAL MORTALITY AND FERTILITY IN EPIDEMIC MODELING Journal article Kazan Kazan National Research Technological University 2025 6 с. Journal article local Sidlyar Mihail Yur'evich Kovaleva O. A. Kovalev S. V. Hlebnikov V. V. vestniktu.ru