@article{AMLG_1950__1_137711,
     author = {Heinrich Behmann},
     title = {Das {Aufl\"osungsproblem} in der {Klassenlogik.}},
     journal = {Archiv f\"ur mathematische Logik und Grundlagenforschung},
     pages = {17--29},
     publisher = {mathdoc},
     volume = {1},
     year = {1950},
     zbl = {0041.34805},
     url = {http://geodesic.mathdoc.fr/item/AMLG_1950__1_137711/}
}