@article{AMLG_1980__20_137971,
     author = {T.B. Flannagan},
     title = {Expansions of models of {ZFC.}},
     journal = {Archiv f\"ur mathematische Logik und Grundlagenforschung},
     pages = {173--180},
     publisher = {mathdoc},
     volume = {20},
     year = {1980},
     zbl = {0483.03029},
     url = {http://geodesic.mathdoc.fr/item/AMLG_1980__20_137971/}
}