@article{JCA_2012_19_2_JCA_2012_19_2_a0,
     author = {P. J. Rabier},
     title = {Generalized {Steffensen} {Inequalities} and {Their} {Optimal} {Constants}},
     journal = {Journal of convex analysis},
     pages = {301--321},
     publisher = {mathdoc},
     volume = {19},
     number = {2},
     year = {2012},
     url = {http://geodesic.mathdoc.fr/item/JCA_2012_19_2_JCA_2012_19_2_a0/}
}