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@article{MZM_1982_32_3_a7, author = {L. P. Vlasov}, title = {Elements of best approximation relative to subspaces of finite codimension}, journal = {Matemati\v{c}eskie zametki}, pages = {325--341}, publisher = {mathdoc}, volume = {32}, number = {3}, year = {1982}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1982_32_3_a7/} }
L. P. Vlasov. Elements of best approximation relative to subspaces of finite codimension. Matematičeskie zametki, Tome 32 (1982) no. 3, pp. 325-341. http://geodesic.mathdoc.fr/item/MZM_1982_32_3_a7/