Geodesic
Varieties of finitely approximable semigroups
Sbornik. Mathematics, Tome 17 (1972) no. 3, pp. 349-355

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In this paper we discuss the question of when a variety of commutative or nilpotent semigroups consists only of finitely approximate semigroups. Moreover, we give necessary and sufficient conditions in order to have $\operatorname{Var}S=q\operatorname{Var}S$ (here $\operatorname{Var}S$ denotes the variety generated by the semigroup $S$, and $q\operatorname{Var}S$ the quasivariety generated by $S$). Bibliography: 3 titles. 
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     author = {S. G. Mamikonyan},
     title = {Varieties of finitely approximable semigroups},
     journal = {Sbornik. Mathematics},
     pages = {349--355},
     publisher = {mathdoc},
     volume = {17},
     number = {3},
     year = {1972},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1972_17_3_a1/}
}
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S. G. Mamikonyan. Varieties of finitely approximable semigroups. Sbornik. Mathematics, Tome 17 (1972) no. 3, pp. 349-355. http://geodesic.mathdoc.fr/item/SM_1972_17_3_a1/