@article{GDZPPN001171526,
title = {Asymptotically Optimal Approximation in Fractional Sobolev Spaces and the Numerical Solution of Differential Equations.},
journal = {Numerische Mathematik},
volume = {22},
year = {1974},
pages = {75-88},
zbl = {0303.65082},
url = {http://dml.mathdoc.fr/item/GDZPPN001171526}
}
Micchelli, C.A.; Miranker, W.L. Asymptotically Optimal Approximation in Fractional Sobolev Spaces and the Numerical Solution of Differential Equations.. Numerische Mathematik, Tome 22 (1974) pp. 75-88. http://gdmltest.u-ga.fr/item/GDZPPN001171526/