TY - JOUR AU - C.A. Micchelli AU - W.L. Miranker TI - Asymptotically Optimal Approximation in Fractional Sobolev Spaces and the Numerical Solution of Differential Equations. JO - Numerische Mathematik PY - 1974 SP - 75 EP - 88 VL - 22 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/NUMA_1974__22_132254/ ID - NUMA_1974__22_132254 ER -