KESAVA MENON, P. A Class of Linear Positive Operators. The Journal of the Indian Mathematical Society, [S. l.], v. 26, n. 1-2, p. 77–80, 1962. DOI: 10.18311/jims/1962/16882. Disponível em: https://informaticsjournals.com/index.php/jims/article/view/16882. Acesso em: 18 jul. 2024.