@article{DAN_1987_296_5_a9,
     author = {K. V. Kozerenko},
     title = {On the number of readings},
     journal = {Doklady Akademii Nauk},
     pages = {1069--1071},
     publisher = {mathdoc},
     volume = {296},
     number = {5},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1987_296_5_a9/}
}