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@article{AL_1970_9_3_a0, author = {A. P. Biryukov}, title = {Varieties of idempotent semigroups}, journal = {Algebra i logika}, pages = {255--273}, publisher = {mathdoc}, volume = {9}, number = {3}, year = {1970}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AL_1970_9_3_a0/} }
A. P. Biryukov. Varieties of idempotent semigroups. Algebra i logika, Tome 9 (1970) no. 3, pp. 255-273. http://geodesic.mathdoc.fr/item/AL_1970_9_3_a0/