IACOB, A. Direct sums of exact covers of complexes. MATHEMATICA SCANDINAVICA, [S. l.], v. 98, n. 2, p. 161–181, 2006. DOI: 10.7146/math.scand.a-14989. Disponível em: https://www.mscand.dk/article/view/14989. Acesso em: 4 may. 2024.