Łazarz M. Characterization of Birkhoff’s Conditions by Means of Cover-Preserving and Partially Cover-Preserving Sublattices. B Sect Log [Internet]. 2016 Dec. 30 [cited 2025 Dec. 8];45(3/4):185–197. Available from: https://czasopisma.uni.lodz.pl/bulletin/article/view/1818