Geodesic
Elements of best approximation relative to subspaces of finite codimension
Matematičeskie zametki, Tome 32 (1982) no. 3, pp. 325-341 
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/
@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},
     year = {1982},
     volume = {32},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1982_32_3_a7/}
}
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