SHARKO, V. V. Additive Functions and Chain Complexes of Projective Modules . Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 56, n. 2, p. 239–246, 2004. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3747. Acesso em: 14 apr. 2025.