Nelson, Evelyn The lattice of equational classes of semigroups with zero. (English) Zbl 0227.08005 Can. Math. Bull. 14, 531-534 (1971). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 6 Documents MSC: 08B15 Lattices of varieties 20M99 Semigroups PDFBibTeX XMLCite \textit{E. Nelson}, Can. Math. Bull. 14, 531--534 (1971; Zbl 0227.08005) Full Text: DOI