PACHPATTE, B. G. A NOTE ON COPSON’S INEQUALITY INVOLVING SERIES OF POSITIVE TERMS. Tamkang Journal of Mathematics, [S. l.], v. 21, n. 1, p. 13–19, 1990. DOI: 10.5556/j.tkjm.21.1990.4640. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/4640. Acesso em: 5 jul. 2022.