@article{RM_1969_24_6_a2,
     author = {A. M. Zubakin},
     title = {On the theory of complete multiplicative periodic orthonormal systems},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     publisher = {mathdoc},
     volume = {24},
     number = {6},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1969_24_6_a2/}
}