@article{10_4064_cm128_2_10,
     author = {Bappaditya Bhowmik and Karl-Joachim Wirths},
     title = {A sharp bound for the {Schwarzian} derivative
 of concave functions},
     journal = {Colloquium Mathematicum},
     pages = {245--251},
     publisher = {mathdoc},
     volume = {128},
     number = {2},
     year = {2012},
     doi = {10.4064/cm128-2-10},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm128-2-10/}
}