GROSS, H.; HAFNER, P. The sublattice of an orthogonal pair in a modular lattice. Annales Fennici Mathematici, [S. l.], v. 4, n. 1, p. 31–40, 1979. DOI: 10.5186/aasfm.1978-79.0406. Disponível em: https://afm.journal.fi/article/view/134333. Acesso em: 25 nov. 2024.