@article{AMLG_1957__3_137736,
     author = {G\"unther Emde},
     title = {Kriterien f\"ur die {Herleitbarkeit} in {Modalit\"atenstrukturen.}},
     journal = {Archiv f\"ur mathematische Logik und Grundlagenforschung},
     pages = {79--111},
     publisher = {mathdoc},
     volume = {3},
     year = {1957},
     zbl = {0079.24409},
     url = {http://geodesic.mathdoc.fr/item/AMLG_1957__3_137736/}
}