@article{GDZPPN002042975,
title = {Representability of recursively enumerable sets in formal theories.},
journal = {Archiv f\"ur mathematische Logik und Grundlagenforschung},
volume = {5},
year = {1960},
pages = {37-41},
zbl = {0118.25102},
url = {http://dml.mathdoc.fr/item/GDZPPN002042975}
}
Ehrenfeucht, A.; Feferman, S. Representability of recursively enumerable sets in formal theories.. Archiv für mathematische Logik und Grundlagenforschung, Tome 5 (1960) pp. 37-41. http://gdmltest.u-ga.fr/item/GDZPPN002042975/