DAS, G. Products of Norlund Method. The Journal of the Indian Mathematical Society, [S. l.], v. 32, n. 3-4, p. 155–171, 1968. DOI: 10.18311/jims/1968/16764. Disponível em: http://informaticsjournals.com/index.php/jims/article/view/16764. Acesso em: 27 apr. 2024.