Sidnyaev, Nikolai, Vasily Sokolyansky, Nadezhda Gorlova, and Valeriya Stolbova. “Mathematical Model of Reproduction System for Multivariate Dynamic Balance of Production and Consumption”. Journal of Progressive Research in Mathematics 12, no. 3 (September 7, 2017): 1932-1945. Accessed May 4, 2024. http://scitecresearch.com/journals/index.php/jprm/article/view/1243.