@article{DM_1993_5_3_a1,
     author = {L. A. Arutyunyan},
     title = {On the cardinality of traces of classes of nonhomogeneous functions},
     journal = {Diskretnaya Matematika},
     pages = {35--39},
     publisher = {mathdoc},
     volume = {5},
     number = {3},
     year = {1993},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DM_1993_5_3_a1/}
}