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@article{IVM_1975_6_a18, author = {P. L. Ul'yanov and V. I. Shcherbakov}, title = {The completeness of systems of functions $\{\Phi^k\}$}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {155--165}, publisher = {mathdoc}, number = {6}, year = {1975}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1975_6_a18/} }
P. L. Ul'yanov; V. I. Shcherbakov. The completeness of systems of functions $\{\Phi^k\}$. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 6 (1975), pp. 155-165. http://geodesic.mathdoc.fr/item/IVM_1975_6_a18/