E.Rovenskikh, Igor, Tamara P. Belikova, Tatyana A.Syrovatskaya, and Eraterina A. Shamrina. “Features of Formation of Regional Reproductive Proportions in Modern Conditions Annotation”. International Journal of Engineering and Technology 7, no. 4.25 (November 30, 2018): 198–200. Accessed April 28, 2025. https://sciencepubco.com/index.php/IJET/article/view/26921.