Murach AA, Pelekhata OB, Soldatov VO. Approximation properties of solutions to multipoint boundary-value problems. Ukr. Mat. Zhurn. [Internet]. 2021Mar.11 [cited 2024Apr.20];73(3):341 -353. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/6505