@article{VMUMM_1983_5_a9,
     author = {V. A. Artamonov},
     title = {Projectively free nilpotent groups},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {41--42},
     year = {1983},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1983_5_a9/}
}