Varieties of idempotent semigroups
Algebra i logika, Tome 9 (1970) no. 3, pp. 255-273.

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     author = {A. P. Biryukov},
     title = {Varieties of idempotent semigroups},
     journal = {Algebra i logika},
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     number = {3},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1970_9_3_a0/}
}
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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/