CCOLQUE TAIPE, F. C. Chain contracting homotopy and a method for relative projective resolutions. Selecciones Matemáticas, [S. l.], v. 9, n. 01, p. 102 - 120, 2022. DOI: 10.17268/sel.mat.2022.01.08. Disponível em: https://revistas.unitru.edu.pe/index.php/SSMM/article/view/3895. Acesso em: 12 jun. 2024.