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@article{MAN_1988__282_2_164474, author = {M. P. Heble}, title = {Approximation of {Differentiable} {Functions} on a {Hilbert} {Space.} {III.}}, journal = {Mathematische Annalen}, pages = {473--484}, publisher = {mathdoc}, volume = {282}, number = {2}, year = {1988}, zbl = {0627.46044}, url = {http://geodesic.mathdoc.fr/item/MAN_1988__282_2_164474/} }
M. P. Heble. Approximation of Differentiable Functions on a Hilbert Space. III.. Mathematische Annalen, Tome 282 (1988) no. 2, pp. 473-484. http://geodesic.mathdoc.fr/item/MAN_1988__282_2_164474/