@article{GDZPPN002042983,
title = {Number theoretic concepts and recursive well-orderings.},
journal = {Archiv f\"ur mathematische Logik und Grundlagenforschung},
volume = {5},
year = {1960},
pages = {42-64},
zbl = {0129.00402},
url = {http://dml.mathdoc.fr/item/GDZPPN002042983}
}
Kreisel, G.; Shoenfield, J. Number theoretic concepts and recursive well-orderings.. Archiv für mathematische Logik und Grundlagenforschung, Tome 5 (1960) pp. 42-64. http://gdmltest.u-ga.fr/item/GDZPPN002042983/