@article{1177731646, author = {Beckenbach, E. F.}, title = {Convexity Properties of Generalized Mean Value Functions}, journal = {Ann. Math. Statist.}, volume = {13}, number = {4}, year = {1942}, pages = { 88-90}, language = {en}, url = {http://dml.mathdoc.fr/item/1177731646} }
Beckenbach, E. F. Convexity Properties of Generalized Mean Value Functions. Ann. Math. Statist., Tome 13 (1942) no. 4, pp. 88-90. http://gdmltest.u-ga.fr/item/1177731646/