@article{1183740995,
author = {Stob, Michael},
title = {Index Sets and Degrees of Unsolvability},
journal = {J. Symbolic Logic},
volume = {47},
number = {1},
year = {1982},
pages = { 241-248},
language = {en},
url = {http://dml.mathdoc.fr/item/1183740995}
}
Stob, Michael. Index Sets and Degrees of Unsolvability. J. Symbolic Logic, Tome 47 (1982) no. 1, pp. 241-248. http://gdmltest.u-ga.fr/item/1183740995/