@article{MM2_1973__8_154147,
     author = {Peter Kosmol},
     title = {Flache {Konvexit\"at} und schwache {Differenzierbarkeit.}},
     journal = {Manuscripta mathematica},
     pages = {267--270},
     publisher = {mathdoc},
     volume = {8},
     year = {1973},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/MM2_1973__8_154147/}
}