TEMIRKHANOVA, A.; BESZHANOVA, A. Boundedness and Compactness of a Certain Class of Matrix Operators with Variable Limits of Summation. Eurasian Mathematical Journal, [S. l.], v. 11, n. 4, p. 66–75, 2020. DOI: 10.32523/2077-9879-2020-11-4-66-75. Disponível em: https://emj.enu.kz/index.php/main/article/view/197. Acesso em: 30 sep. 2026.