$PS$-Injective Modules, $PS$-Flat Modules and $PS$-Coherent Rings. Communications in Mathematical Research, [S. l.], v. 29, n. 2, p. 121–130, 2021. Disponível em: https://global-sci.com/index.php/cmr/article/view/8762. Acesso em: 5 dec. 2025.