@article{MZ_1936__41_168648,
     author = {Fr. Kraus},
     title = {\"Uber konvexe {.Matrixfunktionen.}},
     journal = {Mathematische Zeitschrift},
     pages = {18--42},
     publisher = {mathdoc},
     volume = {41},
     year = {1936},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/MZ_1936__41_168648/}
}