@article{RM_1972_27_2_a0,
     author = {P. L. Ul'yanov},
     title = {Representation of functions by series and classes~$\varphi(L)$},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {1--54},
     publisher = {mathdoc},
     volume = {27},
     number = {2},
     year = {1972},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1972_27_2_a0/}
}