@article{MAN_1955__129_160430,
     author = {G. Springer},
     title = {Extreme {Punkte} der konvexen {H\"ulle} schlichter {Funktionen.}},
     journal = {Mathematische Annalen},
     pages = {230--232},
     publisher = {mathdoc},
     volume = {129},
     year = {1955},
     zbl = {0066.32601},
     url = {http://geodesic.mathdoc.fr/item/MAN_1955__129_160430/}
}