The best constants for a double inequality in a triangle.
Wu, Yu-Dong ; Hu, Nu-Chun ; Kuang, Wei-Ping
JIPAM. Journal of Inequalities in Pure & Applied Mathematics [electronic only], Tome 10 (2009), / Harvested from The Electronic Library of Mathematics
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Publié le : 2009-01-01
EUDML-ID : urn:eudml:doc:130488 
@article{05548969,
     title = {The best constants for a double inequality in a triangle.},
     journal = {JIPAM. Journal of Inequalities in Pure \& Applied Mathematics [electronic only]},
     volume = {10},
     year = {2009},
     zbl = {1169.51020},
     language = {en},
     url = {http://dml.mathdoc.fr/item/05548969}
}

Wu, Yu-Dong; Hu, Nu-Chun; Kuang, Wei-Ping. The best constants for a double inequality in a triangle.. JIPAM. Journal of Inequalities in Pure & Applied Mathematics [electronic only], Tome 10 (2009) . http://gdmltest.u-ga.fr/item/05548969/