Gałuszka, J. Varieties of idempotent groupoids with small clones. (English) Zbl 0953.20052 Colloq. Math. 81, No. 1, 63-87 (1999). Reviewer: M.Csikós (Gödöllö) MSC: 20N02 08A40 20N05 06A15 PDF BibTeX XML Cite \textit{J. Gałuszka}, Colloq. Math. 81, No. 1, 63--87 (1999; Zbl 0953.20052) Full Text: DOI EuDML OpenURL
Venkatanarasimhan, P. V. Semi-ideals in semi-lattices. (English) Zbl 0255.06001 Colloq. Math. 30, 203-212 (1974). MSC: 06B05 06C15 06A15 06F30 54F05 PDF BibTeX XML Cite \textit{P. V. Venkatanarasimhan}, Colloq. Math. 30, 203--212 (1974; Zbl 0255.06001) Full Text: DOI OpenURL
Burris, Stanley The structure of closure congruences. (English) Zbl 0238.08004 Colloq. Math. 24, 3-5 (1971). MSC: 08Axx 06A15 PDF BibTeX XML Cite \textit{S. Burris}, Colloq. Math. 24, 3--5 (1971; Zbl 0238.08004) Full Text: DOI OpenURL