@article{TDM_1998_2_a15,
     author = {B. A. Sevast'yanov},
     title = {On a~connection between the structural characteristics of preimages and images of finite sets for some classes of transformations},
     journal = {Trudy po diskretnoj matematike},
     pages = {296--304},
     publisher = {mathdoc},
     volume = {2},
     year = {1998},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TDM_1998_2_a15/}
}