@article{DM_1989_1_2_a9,
     author = {V. F. Kolchin},
     title = {The number of permutations with restrictions on the lengths of cycles},
     journal = {Diskretnaya Matematika},
     pages = {97--109},
     year = {1989},
     volume = {1},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DM_1989_1_2_a9/}
}