DRESS, A.; HOCHSTÄTTLER, W.; KERN, W. Modular Substructures in Pseudomodular Lattices. MATHEMATICA SCANDINAVICA, [S. l.], v. 74, p. 9–16, 1994. DOI: 10.7146/math.scand.a-12475. Disponível em: https://www.mscand.dk/article/view/12475. Acesso em: 2 may. 2024.