
doi: 10.1007/bf01159700
Translation from Mat. Zametki 40, No.5, 590-597 (Russian) (1986; Zbl 0617.20013).
quasivarieties, quasivariety of 2-nilpotent torsion- free groups, Quasivarieties and varieties of groups, quasiidentities, independent basis, quasivariety, Nilpotent groups, Lattices of varieties, basis of quasiidentities, free 2-nilpotent group, covers
quasivarieties, quasivariety of 2-nilpotent torsion- free groups, Quasivarieties and varieties of groups, quasiidentities, independent basis, quasivariety, Nilpotent groups, Lattices of varieties, basis of quasiidentities, free 2-nilpotent group, covers
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