@article{MZM_1983_34_5_a8,
     author = {I. G. Perfil'eva},
     title = {Representation of functions in $P_{\aleph_0}$ by superpositions of one-place functions and addition},
     journal = {Matemati\v{c}eskie zametki},
     pages = {727--733},
     publisher = {mathdoc},
     volume = {34},
     number = {5},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1983_34_5_a8/}
}