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@article{MZ_1973__130_171873, author = {Robert Schaback}, title = {Optimale {Interpolations-} und {Approximationssysteme.}}, journal = {Mathematische Zeitschrift}, pages = {339--350}, publisher = {mathdoc}, volume = {130}, year = {1973}, zbl = {0248.65037}, url = {http://geodesic.mathdoc.fr/item/MZ_1973__130_171873/} }
Robert Schaback. Optimale Interpolations- und Approximationssysteme.. Mathematische Zeitschrift, Tome 130 (1973), pp. 339-350. http://geodesic.mathdoc.fr/item/MZ_1973__130_171873/