@article{05654098,
title = {Reverse triangle inequality in Hilbert },
journal = {JIPAM. Journal of Inequalities in Pure \& Applied Mathematics [electronic only]},
volume = {10},
year = {2009},
zbl = {1190.46045},
language = {en},
url = {http://dml.mathdoc.fr/item/05654098}
}
Khosravi, Maryam; Mahyar, Hakimeh; Moslehian, Mohammad Sal. Reverse triangle inequality in Hilbert . JIPAM. Journal of Inequalities in Pure & Applied Mathematics [electronic only], Tome 10 (2009) . http://gdmltest.u-ga.fr/item/05654098/