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@article{SF_1993__46_1_135231, author = {J. Jezek and R. McKenzie}, title = {Definability in the lattice of equational theories of semigroups.}, journal = {Semigroup forum}, pages = {199--245}, publisher = {mathdoc}, volume = {46}, number = {1}, year = {1993}, zbl = {0782.20051}, url = {http://geodesic.mathdoc.fr/item/SF_1993__46_1_135231/} }
J. Jezek; R. McKenzie. Definability in the lattice of equational theories of semigroups.. Semigroup forum, Tome 46 (1993) no. 1, pp. 199-245. http://geodesic.mathdoc.fr/item/SF_1993__46_1_135231/