KARAKAYA, V. $theta_sigma$-summable sequences and some matrix transformations. Tamkang Journal of Mathematics, [S. l.], v. 35, n. 4, p. 313–320, 2004. DOI: 10.5556/j.tkjm.35.2004.190. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/190. Acesso em: 29 apr. 2024.