@article{AMLG_1965__8_137780,
     author = {Rolf Schock},
     title = {On {Definitions.}},
     journal = {Archiv f\"ur mathematische Logik und Grundlagenforschung},
     pages = {28--44},
     publisher = {mathdoc},
     volume = {8},
     year = {1965},
     zbl = {0173.00503},
     url = {http://geodesic.mathdoc.fr/item/AMLG_1965__8_137780/}
}