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@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/} }
V. A. Medvedev. Optimal representation of functions by the sum of two compositions. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 5 (1991), pp. 41-50. http://geodesic.mathdoc.fr/item/IVM_1991_5_a8/