@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/}
}