%0 Journal Article %A Claudia Cottin %T Mixed K-Functionals: A Measure of Smoothness for Blending-type Approximation. %J Mathematische Zeitschrift %D 1990 %P 69-84 %V 204 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/MZ_1990__204_3_183757/ %F MZ_1990__204_3_183757