@article{1028999976, author = {Holmes, Richard and Kripke, Bernard}, title = {Smoothness of approximation.}, journal = {Michigan Math. J.}, volume = {15}, number = {1}, year = {1968}, pages = { 225-248}, language = {en}, url = {http://dml.mathdoc.fr/item/1028999976} }
Holmes, Richard; Kripke, Bernard. Smoothness of approximation.. Michigan Math. J., Tome 15 (1968) no. 1, pp. 225-248. http://gdmltest.u-ga.fr/item/1028999976/