SONMEZ, A. ON ABSOLUTE NORLUND SUMMABILITY OF ORTHOGONAL SERIES. Tamkang Journal of Mathematics, [S. l.], v. 29, n. 4, p. 245–247, 1998. DOI: 10.5556/j.tkjm.29.1998.4243. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/4243. Acesso em: 2 may. 2024.