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@article{IVM_1976_5_a3, author = {V. A. Koshcheev}, title = {Some properties of the $\delta$-projection in normed linear spaces}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {36--42}, publisher = {mathdoc}, number = {5}, year = {1976}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1976_5_a3/} }
V. A. Koshcheev. Some properties of the $\delta$-projection in normed linear spaces. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 5 (1976), pp. 36-42. http://geodesic.mathdoc.fr/item/IVM_1976_5_a3/