@article{ADM_2009_4_a10,
     author = {Javier Otal and Nikolaj N.Semko},
     title = {Groups with small cocentralizers},
     journal = {Algebra and discrete mathematics},
     pages = {135--157},
     year = {2009},
     number = {4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ADM_2009_4_a10/}
}