@article{1183505630, author = {Whitney, Hassler}, title = {On the extension of differentiable functions}, journal = {Bull. Amer. Math. Soc.}, volume = {50}, number = {12}, year = {1944}, pages = { 76-81}, language = {en}, url = {http://dml.mathdoc.fr/item/1183505630} }
Whitney, Hassler. On the extension of differentiable functions. Bull. Amer. Math. Soc., Tome 50 (1944) no. 12, pp. 76-81. http://gdmltest.u-ga.fr/item/1183505630/