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@article{AL_1996_35_3_a4, author = {I. V. Latkin}, title = {Arithmetic hierarchy of torsion-free nilpotent groups}, journal = {Algebra i logika}, pages = {308--313}, publisher = {mathdoc}, volume = {35}, number = {3}, year = {1996}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AL_1996_35_3_a4/} }
I. V. Latkin. Arithmetic hierarchy of torsion-free nilpotent groups. Algebra i logika, Tome 35 (1996) no. 3, pp. 308-313. http://geodesic.mathdoc.fr/item/AL_1996_35_3_a4/