@article{TIMM_2012_18_3_a7,
     author = {N. N. Vorob'ev},
     title = {On direct products of classes of finite groups},
     journal = {Trudy Instituta matematiki i mehaniki},
     pages = {67--74},
     publisher = {mathdoc},
     volume = {18},
     number = {3},
     year = {2012},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TIMM_2012_18_3_a7/}
}