@article{1183555728,
author = {Cooper, S. Barry},
title = {The jump is definable in the structure of the degrees of unsolvability},
journal = {Bull. Amer. Math. Soc. (N.S.)},
volume = {23},
number = {1},
year = {1990},
pages = { 151-158},
language = {en},
url = {http://dml.mathdoc.fr/item/1183555728}
}
Cooper, S. Barry. The jump is definable in the structure of the degrees of unsolvability. Bull. Amer. Math. Soc. (N.S.), Tome 23 (1990) no. 1, pp. 151-158. http://gdmltest.u-ga.fr/item/1183555728/