@article{AMLG_1964__7_137769,
     author = {E.W. Beth},
     title = {Semantische {Begr\"undung} der derivativen {Implikationslogik.}},
     journal = {Archiv f\"ur mathematische Logik und Grundlagenforschung},
     pages = {23--28},
     publisher = {mathdoc},
     volume = {7},
     year = {1964},
     zbl = {0166.00202},
     url = {http://geodesic.mathdoc.fr/item/AMLG_1964__7_137769/}
}