@article{10_4064_cm92_1_9,
     author = {Robert E. Zink},
     title = {On the {Gram{\textendash}Schmidt} orthonormalizatons
 of subsystems of {Schauder} systems},
     journal = {Colloquium Mathematicum},
     pages = {97--110},
     publisher = {mathdoc},
     volume = {92},
     number = {1},
     year = {2002},
     doi = {10.4064/cm92-1-9},
     language = {de},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm92-1-9/}
}