@article{IVM_1968_7_a9,
     author = {I. N. Pak},
     title = {Sums of series in {Chebyshev} polynomials},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {61--69},
     publisher = {mathdoc},
     number = {7},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1968_7_a9/}
}