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@article{AL_1982_21_3_a0, author = {T. A. Martynova}, title = {The largest groupoid of varieties of semigroups with zero}, journal = {Algebra i logika}, pages = {251--268}, publisher = {mathdoc}, volume = {21}, number = {3}, year = {1982}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AL_1982_21_3_a0/} }
T. A. Martynova. The largest groupoid of varieties of semigroups with zero. Algebra i logika, Tome 21 (1982) no. 3, pp. 251-268. http://geodesic.mathdoc.fr/item/AL_1982_21_3_a0/