@article{AL_2009_48_2_a3,
     author = {A. G. Miasnikov and M. Sohrabi},
     title = {Groups elementarily equivalent to a~free 2-nilpotent group of finite rank},
     journal = {Algebra i logika},
     pages = {203--244},
     publisher = {mathdoc},
     volume = {48},
     number = {2},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_2009_48_2_a3/}
}