@article{IVM_1968_6_a3,
     author = {E. A. Bredikhina},
     title = {A~theorem of {Sidon} on lacunary {Fourier} series},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {21--27},
     publisher = {mathdoc},
     number = {6},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1968_6_a3/}
}