@article{AMLG_1972__15_137863,
     author = {Gerd Mitschke},
     title = {...-definierbare {Funktionen} auf {Peanoalgebren.}},
     journal = {Archiv f\"ur mathematische Logik und Grundlagenforschung},
     pages = {31--35},
     publisher = {mathdoc},
     volume = {15},
     year = {1972},
     zbl = {0252.02041},
     url = {http://geodesic.mathdoc.fr/item/AMLG_1972__15_137863/}
}