Geodesic
On multipliers of torsion-free nilpotent groups
Matematičeskie zametki, Tome 5 (1969) no. 5, pp. 541-544 
G. F. Bachurin. On multipliers of torsion-free nilpotent groups. Matematičeskie zametki, Tome 5 (1969) no. 5, pp. 541-544. http://geodesic.mathdoc.fr/item/MZM_1969_5_5_a5/
@article{MZM_1969_5_5_a5,
     author = {G. F. Bachurin},
     title = {On multipliers of torsion-free nilpotent groups},
     journal = {Matemati\v{c}eskie zametki},
     pages = {541--544},
     year = {1969},
     volume = {5},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1969_5_5_a5/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

The notion of the Schur multiplier is carried over to torsion-free nilpotent groups of finite rank, and the relation between the rank of a torsion-free nilpotent group and the rank of its multiplier is determined, [3].