Сав’юк ЛО. SYSTEM APPROACHES AND WAYS OF OPTIMAL IMPLEMENTATION OF DISTANCE LEARNING SYSTEMS TO HIGHER EDUCATION OF UKRAINE. Number [Internet]. 2019 Mar. 7 [cited 2025 Apr. 9];(1(13):280-4. Available from: https://pvntsh.nung.edu.ua/index.php/number/article/view/277