@article{AMLG_1975__17_137898,
     author = {Leo Marcus},
     title = {A type-open minimal model.},
     journal = {Archiv f\"ur mathematische Logik und Grundlagenforschung},
     pages = {17--24},
     publisher = {mathdoc},
     volume = {17},
     year = {1975},
     zbl = {0323.02058},
     url = {http://geodesic.mathdoc.fr/item/AMLG_1975__17_137898/}
}