KHAN, M. A. Commutativity Theorems for Rings With Constraints on Commutators. The Journal of the Indian Mathematical Society, [S. l.], v. 66, n. 1-4, p. 113–124, 1999. Disponível em: https://www.informaticsjournals.com/index.php/jims/article/view/21963. Acesso em: 29 apr. 2024.