Geodesic
On the existence of stably nilpotent subgroups in locally nilpotent groups
Matematičeskie zametki, Tome 4 (1968) no. 3, pp. 361-368 
D. I. Zaitsev. On the existence of stably nilpotent subgroups in locally nilpotent groups. Matematičeskie zametki, Tome 4 (1968) no. 3, pp. 361-368. http://geodesic.mathdoc.fr/item/MZM_1968_4_3_a12/
@article{MZM_1968_4_3_a12,
     author = {D. I. Zaitsev},
     title = {On the existence of stably nilpotent subgroups in locally nilpotent groups},
     journal = {Matemati\v{c}eskie zametki},
     pages = {361--368},
     year = {1968},
     volume = {4},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1968_4_3_a12/}
}
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%G ru
%F MZM_1968_4_3_a12

Voir la notice de l'article provenant de la source Math-Net.Ru

A condition for the existence of stably nilpotent subgroups of a given nilpotency class in a locally nilpotent group is established.