@article{NUMA_1974__22_132254,
     author = {C.A. Micchelli and W.L. Miranker},
     title = {Asymptotically {Optimal} {Approximation} in {Fractional} {Sobolev} {Spaces} and the {Numerical} {Solution} of {Differential} {Equations.}},
     journal = {Numerische Mathematik},
     pages = {75--88},
     publisher = {mathdoc},
     volume = {22},
     year = {1974},
     zbl = {0303.65082},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1974__22_132254/}
}