@article{VMUMM_1991_3_a7,
     author = {A. G. Makanin},
     title = {On the compressibility of torsion-free finitely generated nilpotent groups},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {36--41},
     year = {1991},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1991_3_a7/}
}