@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/