@article{GDZPPN002287544,
title = {Computing Degrees of Unsolvability.},
journal = {Mathematische Annalen},
volume = {137},
year = {1959},
pages = {125-140},
zbl = {0086.01101},
url = {http://dml.mathdoc.fr/item/GDZPPN002287544}
}
ROGERS, H. Computing Degrees of Unsolvability.. Mathematische Annalen, Tome 137 (1959) pp. 125-140. http://gdmltest.u-ga.fr/item/GDZPPN002287544/