@article{DAN_1966_170_1_a1,
     author = {D. L. Berman},
     title = {Extremal problems in the theory of polynomial operations},
     journal = {Doklady Akademii Nauk},
     pages = {13--16},
     publisher = {mathdoc},
     volume = {170},
     number = {1},
     year = {1966},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1966_170_1_a1/}
}