@article{AL_1987_26_4_a4,
     author = {O. G. Kharlampovich},
     title = {The word problem for subvarieties of the variety $\mathfrak{N}_2\mathfrak{A}$},
     journal = {Algebra i logika},
     pages = {481--501},
     publisher = {mathdoc},
     volume = {26},
     number = {4},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1987_26_4_a4/}
}