@article{AMLG_1983__23_138006,
     author = {T.B. Flannagan},
     title = {A note on a proof of {Sherpherdson.}},
     journal = {Archiv f\"ur mathematische Logik und Grundlagenforschung},
     pages = {55--60},
     year = {1983},
     volume = {23},
     zbl = {0544.03030},
     url = {http://geodesic.mathdoc.fr/item/AMLG_1983__23_138006/}
}