@article{MZ_1967__95_170650,
     author = {E.W. Cheney and A.A. Goldstein},
     title = {Mean-Square {Approximation} by {Generalized} {Rational} {Functions.}},
     journal = {Mathematische Zeitschrift},
     pages = {232--241},
     publisher = {mathdoc},
     volume = {95},
     year = {1967},
     zbl = {0162.08501},
     url = {http://geodesic.mathdoc.fr/item/MZ_1967__95_170650/}
}