Geodesic
On accessible classes of groups and semigroups
Sbornik. Mathematics, Tome 19 (1973) no. 2, pp. 231-241

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In this paper it is proved that any residually complete class of groups is either 1-step accessible in the class of all groups or is not $\gamma$-step accessible for any ordinal number $\gamma$, and there is given an extensive class of varieties of semigroups which cannot be $\gamma$-step accessible in the class of all semigroups. Bibliography: 15 titles. 
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     author = {L. M. Martynov},
     title = {On accessible classes of groups and semigroups},
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L. M. Martynov. On accessible classes of groups and semigroups. Sbornik. Mathematics, Tome 19 (1973) no. 2, pp. 231-241. http://geodesic.mathdoc.fr/item/SM_1973_19_2_a7/