KRYVOKULSKA N. COMMERCIAL ACTIVITY IN THE SYSTEM OF A MULTILEVEL SUSTAINABLE DEVELOPMENT ECONOMY. Reg. asp. rozvit. product.sil Ukr. [Internet]. 2026 Jun. 14 [cited 2026 Jul. 15];1(31):4-19. Available from: https://rarrpsu.wunu.edu.ua/index.php/rapfdu/article/view/608