@article{AMLG_1977__18_137935,
     author = {W. Sch\"onfeld},
     title = {Eine algebraische {Konstruktion} abz\"ahlbarer {Modelle.}},
     journal = {Archiv f\"ur mathematische Logik und Grundlagenforschung},
     pages = {135--144},
     publisher = {mathdoc},
     volume = {18},
     year = {1977},
     zbl = {0411.03020},
     url = {http://geodesic.mathdoc.fr/item/AMLG_1977__18_137935/}
}