@article{DAN_1968_179_4_a3,
     author = {E. V. Voronovskaya},
     title = {The construction of extremal trigonometric polynomials of mixed type},
     journal = {Doklady Akademii Nauk},
     pages = {768--771},
     year = {1968},
     volume = {179},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1968_179_4_a3/}
}