@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/