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@article{IVM_1964_6_a1, author = {D. L. Berman}, title = {The solution of an extremal problem in the theory of interpolation}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {10--14}, publisher = {mathdoc}, number = {6}, year = {1964}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1964_6_a1/} }
D. L. Berman. The solution of an extremal problem in the theory of interpolation. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 6 (1964), pp. 10-14. http://geodesic.mathdoc.fr/item/IVM_1964_6_a1/