KHMELNITSKII, N. A. Cockcroft–Swan Theorem for Projective Crossed Chain Complexes. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 66, n. 12, p. 1694–1704, 2014. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2255. Acesso em: 5 dec. 2025.