@article{TDM_2002_6_a9,
     author = {B. A. Sevast'yanov},
     title = {Structural characteristics of some nonuniform mappings of finite sets},
     journal = {Trudy po diskretnoj matematike},
     pages = {184--193},
     year = {2002},
     volume = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TDM_2002_6_a9/}
}