@article{MZ_1975__142_172180,
     author = {Wolfgang Tutschke},
     title = {Eine {Differenzierbarkeit} f\"ur approximativ analytische {Funktionen.}},
     journal = {Mathematische Zeitschrift},
     pages = {27--32},
     publisher = {mathdoc},
     volume = {142},
     year = {1975},
     zbl = {0292.30040},
     url = {http://geodesic.mathdoc.fr/item/MZ_1975__142_172180/}
}