@article{AMLG_1966__10_137801,
     author = {Horst Luckhardt},
     title = {Von {Wright's} relative {Modalit\"aten.}},
     journal = {Archiv f\"ur mathematische Logik und Grundlagenforschung},
     pages = {97--122},
     publisher = {mathdoc},
     volume = {10},
     year = {1966},
     zbl = {0165.30601},
     url = {http://geodesic.mathdoc.fr/item/AMLG_1966__10_137801/}
}