Kumratova, Alfira M., Elena V. Popova, Sergey A. Kurnosov, and Nataliya S. Kurnosova. “The Concept of a Two-Level Approach on Modeling of Socio-Economic Processes”. Modern Economics: Problems and Solutions 8 (August 27, 2021): 8-16. Accessed December 5, 2025. https://journals.vsu.ru/meps/article/view/7182.