@article{1183735045,
author = {Hensel, Gustav and Putnam, Hilary},
title = {On the Notational Independence of Various Hierarchies of Degrees of Unsolvability},
journal = {J. Symbolic Logic},
volume = {30},
number = {1},
year = {1965},
pages = { 69-86},
language = {en},
url = {http://dml.mathdoc.fr/item/1183735045}
}
Hensel, Gustav; Putnam, Hilary. On the Notational Independence of Various Hierarchies of Degrees of Unsolvability. J. Symbolic Logic, Tome 30 (1965) no. 1, pp. 69-86. http://gdmltest.u-ga.fr/item/1183735045/