The Existence and Unicity of Best Approximations.
Cheney, E.W. ; Wulbert, D.E.
Mathematica Scandinavica, Tome 24 (1969), p. 113-140 / Harvested from Göttinger Digitalisierungszentrum
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Publié le : 1969-01-01
EUDML-ID : urn:eudml:doc:166085 
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     title = {The Existence and Unicity of Best Approximations.},
     journal = {Mathematica Scandinavica},
     volume = {24},
     year = {1969},
     pages = {113-140},
     zbl = {0186.18701},
     url = {http://dml.mathdoc.fr/item/GDZPPN002349876}
}

Cheney, E.W.; Wulbert, D.E. The Existence and Unicity of Best Approximations.. Mathematica Scandinavica, Tome 24 (1969) pp. 113-140. http://gdmltest.u-ga.fr/item/GDZPPN002349876/