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@article{SF_1989__39_2_134971, author = {L.M. Shneerson}, title = {On the axiomatic rank of varieties generated by a semigroup or monoid with one defining relation.}, journal = {Semigroup forum}, pages = {17--38}, publisher = {mathdoc}, volume = {39}, number = {2}, year = {1989}, zbl = {0671.20056}, url = {http://geodesic.mathdoc.fr/item/SF_1989__39_2_134971/} }
L.M. Shneerson. On the axiomatic rank of varieties generated by a semigroup or monoid with one defining relation.. Semigroup forum, Tome 39 (1989) no. 2, pp. 17-38. http://geodesic.mathdoc.fr/item/SF_1989__39_2_134971/