%0 Journal Article %A C.A. Micchelli %A W.L. Miranker %T Asymptotically Optimal Approximation in Fractional Sobolev Spaces and the Numerical Solution of Differential Equations. %J Numerische Mathematik %D 1974 %P 75-88 %V 22 %I mathdoc %U http://geodesic.mathdoc.fr/item/NUMA_1974__22_132254/ %F NUMA_1974__22_132254