@article{IVM_1991_5_a8,
     author = {V. A. Medvedev},
     title = {Optimal representation of functions by the sum of two compositions},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {41--50},
     publisher = {mathdoc},
     number = {5},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1991_5_a8/}
}