@article{IVM_1970_7_a2,
     author = {D. L. Berman},
     title = {Certain trigonometric identities and their application in interpolation theory},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {26--34},
     publisher = {mathdoc},
     number = {7},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1970_7_a2/}
}