OKUYAMA, Y.; MIYAMOTO, I. ON THE DOUBLE NORLUND SUMMABILITY OF DOUBLE FOURIER SERIES. Tamkang Journal of Mathematics, [S. l.], v. 27, n. 2, p. 133–144, 1996. DOI: 10.5556/j.tkjm.27.1996.4351. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/4351. Acesso em: 8 may. 2024.