@article{TDM_2003_7_a9,
     author = {V. N. Sachkov},
     title = {Deficiencies of finite group permutations},
     journal = {Trudy po diskretnoj matematike},
     pages = {156--175},
     year = {2003},
     volume = {7},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TDM_2003_7_a9/}
}