@article{IIGUM_2010_3_4_a2,
     author = {G. P. Egorychev and M. N. Davletshin},
     title = {Enumerative problems in some matrix rings and finite groups},
     journal = {The Bulletin of Irkutsk State University. Series Mathematics},
     pages = {21--32},
     publisher = {mathdoc},
     volume = {3},
     number = {4},
     year = {2010},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IIGUM_2010_3_4_a2/}
}