@article{GDZPPN002045559, title = {A note on a proof of Sherpherdson.}, journal = {Archiv f\"ur mathematische Logik und Grundlagenforschung}, volume = {23}, year = {1983}, pages = {55-60}, zbl = {0544.03030}, url = {http://dml.mathdoc.fr/item/GDZPPN002045559} }
Flannagan, T.B. A note on a proof of Sherpherdson.. Archiv für mathematische Logik und Grundlagenforschung, Tome 23 (1983) pp. 55-60. http://gdmltest.u-ga.fr/item/GDZPPN002045559/