OSPANOV, K.N.; BEKJAN, T.N.; BEISENOVA, D.R. Coercive solvability conditions of an infinite system of difference equations with complex coefficients. Bulletin of the Karaganda University. Mathematics Series, [S. l.], v. 87, n. 3, p. 59–69, 2017. DOI: 10.31489/2017m3/59-69. Disponível em: https://mts.buketov.edu.kz/index.php/mathematics-vestnik/article/view/168. Acesso em: 10 jul. 2025.