@article{05224578,
title = {Extensions and sharpenings of Jordan's and Kober's inequalities.},
journal = {JIPAM. Journal of Inequalities in Pure \& Applied Mathematics [electronic only]},
volume = {7},
year = {2006},
zbl = {1132.26335},
language = {en},
url = {http://dml.mathdoc.fr/item/05224578}
}
Zhang, Xiaohui; Wang, Gendi; Chu, Yuming. Extensions and sharpenings of Jordan's and Kober's inequalities.. JIPAM. Journal of Inequalities in Pure & Applied Mathematics [electronic only], Tome 7 (2006) . http://gdmltest.u-ga.fr/item/05224578/