Ospanov K, Bekjan T, Beisenova D. Coercive solvability conditions of an infinite system of difference equations with complex coefficients. M [Internet]. 2017 Sep. 29 [cited 2025 Aug. 26];87(3):59-6. Available from: http://mts.buketov.edu.kz/index.php/mathematics-vestnik/article/view/168