@article{DAN_1973_208_3_a0,
     author = {V. B. Alekseev},
     title = {On the number of $k$-valued monotonic functions},
     journal = {Doklady Akademii Nauk},
     pages = {505--508},
     publisher = {mathdoc},
     volume = {208},
     number = {3},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1973_208_3_a0/}
}