Шегда ЛМ. NECESSARY CONDITION FOR THE EXISTENCE OF SOLUTIONS OF A WEAKLY NONLINEAR BOUNDARY-VALUE PROBLEM WITH IMPULSIVE ACTION. Number [Internet]. 2019 Mar. 6 [cited 2025 Dec. 6];(1(25):40-4. Available from: https://pvntsh.nung.edu.ua/index.php/number/article/view/203