Bances, Ricardo M., and Norberto J. Chau. “CMC Complejos de Cadenas de R-Módulos”. Pro Mathematica 25, no. 50 (June 11, 2011): 203–250. Accessed October 10, 2026. https://revistas.pucp.edu.pe/index.php/promathematica/article/view/2665.