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@article{SF_1983__26_134608, author = {T.A. Martynova}, title = {The groupoid of 0-reduced varieties of {Semigroups} (n).}, journal = {Semigroup forum}, pages = {249--274}, publisher = {mathdoc}, volume = {26}, year = {1983}, zbl = {0546.20052}, url = {http://geodesic.mathdoc.fr/item/SF_1983__26_134608/} }
T.A. Martynova. The groupoid of 0-reduced varieties of Semigroups (n).. Semigroup forum, Tome 26 (1983), pp. 249-274. http://geodesic.mathdoc.fr/item/SF_1983__26_134608/