Nedokis VA, Samoilenko AM, Teplinsky YV. Truncation method for countable-point boundary-value problems in the space of bounded number sequences. Ukr. Mat. Zhurn. [Internet]. 2004Sep.25 [cited 2024Jul.27];56(9):1203-30. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/3836