CHEN, Jianlong; SHEN, Liang. $C2$ Property of Column Finite Matrix Rings. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 66, n. 12, p. 1718–1722, 2014. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2257. Acesso em: 5 dec. 2025.