SHEWALE, R. S.; KHARAT, V. Some Characterizations of Upper Semimodular Lattices and Posets. The Journal of the Indian Mathematical Society, [S. l.], v. 82, n. 3-4, p. 189–205, 2015. Disponível em: https://www.informaticsjournals.com/index.php/jims/article/view/1693. Acesso em: 3 may. 2024.