Shcherbakova A, Lytvynenko D, Skrylnyk N. THE USE OF GRAVITY MODELS FOR MANAGING ECONOMY IN THE CONDITIONS OF INSTABILITY. SJPU [Internet]. 2017Jan.20 [cited 2024Nov.24];21(2):45-4. Available from: http://pnap.ap.edu.pl/index.php/pnap/article/view/134