@article{1177729956, author = {Sard, Arthur}, title = {Smoothest Approximation Formulas}, journal = {Ann. Math. Statist.}, volume = {20}, number = {4}, year = {1949}, pages = { 612-615}, language = {en}, url = {http://dml.mathdoc.fr/item/1177729956} }
Sard, Arthur. Smoothest Approximation Formulas. Ann. Math. Statist., Tome 20 (1949) no. 4, pp. 612-615. http://gdmltest.u-ga.fr/item/1177729956/