@article{SEMR_2013_10_a18,
     author = {Yu. V. Lytkin},
     title = {On groups critical with respect to a set of natural numbers},
     journal = {Sibirskie \`elektronnye matemati\v{c}eskie izvesti\^a},
     pages = {666--675},
     publisher = {mathdoc},
     volume = {10},
     year = {2013},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SEMR_2013_10_a18/}
}