Geodesic
Idempotents in the semigroup of quasivarieties of torsion-free groups
Matematičeskie zametki, Tome 47 (1990) no. 5, pp. 21-25.

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     author = {A. I. Budkin},
     title = {Idempotents in the semigroup of quasivarieties of torsion-free groups},
     journal = {Matemati\v{c}eskie zametki},
     pages = {21--25},
     publisher = {mathdoc},
     volume = {47},
     number = {5},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1990_47_5_a2/}
}
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A. I. Budkin. Idempotents in the semigroup of quasivarieties of torsion-free groups. Matematičeskie zametki, Tome 47 (1990) no. 5, pp. 21-25. http://geodesic.mathdoc.fr/item/MZM_1990_47_5_a2/