Geodesic
The Occurrence Problem for Subvarieties of the Variety $\mathbf N_2\mathbf A$ Revisited
Algebra i logika, Tome 40 (2001) no. 5, pp. 580-592.

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The occurrence problem in finitely generated subgroups is proved undecidable for groups that are finitely presented in some subvarieties of the variety $\mathbf N_2\mathbf A$.
Keywords: variety of groups, nilpotent group, the occurrence problem in finitely generated subgroups. 
@article{AL_2001_40_5_a5,
     author = {I. V. Latkin},
     title = {The {Occurrence} {Problem} for {Subvarieties} of the {Variety} $\mathbf N_2\mathbf A$ {Revisited}},
     journal = {Algebra i logika},
     pages = {580--592},
     publisher = {mathdoc},
     volume = {40},
     number = {5},
     year = {2001},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_2001_40_5_a5/}
}
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I. V. Latkin. The Occurrence Problem for Subvarieties of the Variety $\mathbf N_2\mathbf A$ Revisited. Algebra i logika, Tome 40 (2001) no. 5, pp. 580-592. http://geodesic.mathdoc.fr/item/AL_2001_40_5_a5/