SCHWEIZER, B. Remarks on a Functional Equation. The Journal of the Indian Mathematical Society, [S. l.], v. 23, n. 3-4, p. 97–115, 1959. DOI: 10.18311/jims/1959/16939. Disponível em: http://informaticsjournals.com/index.php/jims/article/view/16939. Acesso em: 6 may. 2024.