HUSAIN, F.; KAZIM, M. A. Contribution to Associative Laws in Subtractive Group. The Journal of the Indian Mathematical Society, [S. l.], v. 28, n. 2, p. 83–97, 1964. DOI: 10.18311/jims/1964/16849. Disponível em: http://informaticsjournals.com/index.php/jims/article/view/16849. Acesso em: 7 may. 2024.