@article{AL_2011_50_1_a2,
     author = {K. N. Ponomarev},
     title = {Factor morphisms and centroids of locally nilpotent groups},
     journal = {Algebra i logika},
     pages = {42--67},
     publisher = {mathdoc},
     volume = {50},
     number = {1},
     year = {2011},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_2011_50_1_a2/}
}