On the strengthened Jordan's inequality.
Li, Jian-Lin ; Li, Yan-Ling
Journal of Inequalities and Applications [electronic only], Tome 2007 (2007), / Harvested from The Electronic Library of Mathematics
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Publié le : 2007-01-01
DOI : https://doi.org/10.1155/2007/74328
EUDML-ID : urn:eudml:doc:128584 
@article{05236971,
     title = {On the strengthened Jordan's inequality.},
     journal = {Journal of Inequalities and Applications [electronic only]},
     volume = {2007},
     year = {2007},
     doi = {10.1155/2007/74328},
     zbl = {1133.26006},
     language = {en},
     url = {http://dml.mathdoc.fr/item/05236971}
}

Li, Jian-Lin; Li, Yan-Ling. On the strengthened Jordan's inequality.. Journal of Inequalities and Applications [electronic only], Tome 2007 (2007) . doi : 10.1155/2007/74328. http://gdmltest.u-ga.fr/item/05236971/