NTIENJEM , Ebénézer. Elementary Evaluation of Convolution Sums Involving the Divisor Function for a Class of Levels. North-Western European Journal of Mathematics, [S. l.], n. 5, p. 99–162, 2019. Disponível em: https://nwejm.univ-lille.fr/index.php/nwejm/article/view/40.. Acesso em: 18 oct. 2024.