@article{MZ_1936__40_168620,
     author = {M. Krafft},
     title = {\"Uber konvexe {Funktionen}},
     journal = {Mathematische Zeitschrift},
     pages = {469--476},
     publisher = {mathdoc},
     volume = {40},
     year = {1936},
     zbl = {0012.10304},
     url = {http://geodesic.mathdoc.fr/item/MZ_1936__40_168620/}
}