@article{02010122, title = {About an old problem of Karamata.}, journal = {Publications de l'Institut Math\'ematique. Nouvelle S\'erie}, volume = {71(85)}, year = {2002}, pages = {91-96}, doi = {10.2298/PIM0271091S}, zbl = {1034.41016}, language = {en}, url = {http://dml.mathdoc.fr/item/02010122} }
Simić, Slavko. About an old problem of Karamata.. Publications de l'Institut Mathématique. Nouvelle Série, Tome 71(85) (2002) pp. 91-96. doi : 10.2298/PIM0271091S. http://gdmltest.u-ga.fr/item/02010122/