@article{1077466955, author = {Bellman, Richard}, title = {Converses of Schwarz's inequality}, journal = {Duke Math. J.}, volume = {23}, number = {1}, year = {1956}, pages = { 429-434}, language = {en}, url = {http://dml.mathdoc.fr/item/1077466955} }
Bellman, Richard. Converses of Schwarz’s inequality. Duke Math. J., Tome 23 (1956) no. 1, pp. 429-434. http://gdmltest.u-ga.fr/item/1077466955/