@article{DAN_1960_130_5_a11,
     author = {S. Ya. Havinson},
     title = {On a class of extremal problems for polynomials},
     journal = {Doklady Akademii Nauk},
     pages = {997--1000},
     publisher = {mathdoc},
     volume = {130},
     number = {5},
     year = {1960},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1960_130_5_a11/}
}