ŁAZARZ, M. Characterization of Birkhoff’s Conditions by Means of Cover-Preserving and Partially Cover-Preserving Sublattices. Bulletin of the Section of Logic, [S. l.], v. 45, n. 3/4, p. 185–197, 2016. DOI: 10.18778/0138-0680.45.3.4.04. Disponível em: https://czasopisma.uni.lodz.pl/bulletin/article/view/1818. Acesso em: 6 may. 2024.