Shcherbakova, Anastasia, Daryna Lytvynenko, and Nadina Skrylnyk. “THE USE OF GRAVITY MODELS FOR MANAGING ECONOMY IN THE CONDITIONS OF INSTABILITY”. Scientific Journal of Polonia University 21, no. 2 (January 20, 2017): 45-54. Accessed April 3, 2025. http://pnap.ap.edu.pl/index.php/pnap/article/view/134.