SHAHOODH, M. K. . (θ1,θ2) - Derivation Pair on Rings. Ibn AL-Haitham Journal For Pure and Applied Sciences, [S. l.], v. 35, n. 2, p. 108–116, 2022. DOI: 10.30526/35.2.2723. Disponível em: https://jih.uobaghdad.edu.iq/index.php/j/article/view/2723. Acesso em: 28 jun. 2022.