@article{JRAM_1980__313_152204,
     author = {R.M. Aron and J.B. Prolla},
     title = {Polynomial approximation of differentiable functions on {Banach} spaces.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {195--216},
     year = {1980},
     volume = {313},
     zbl = {0413.41022},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1980__313_152204/}
}