@article{10_4064_sm192_1_3,
     author = {Jacek Tabor and J\'ozef Tabor},
     title = {Characterization of convex functions},
     journal = {Studia Mathematica},
     pages = {29--37},
     year = {2009},
     volume = {192},
     number = {1},
     doi = {10.4064/sm192-1-3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm192-1-3/}
}