@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/}
}