@article{1183745140, author = {Calhoun, William C. and Slaman, Theodore A.}, title = {The $\Pi^0\_2$ Enumeration Degrees are Not Dense}, journal = {J. Symbolic Logic}, volume = {61}, number = {1}, year = {1996}, pages = { 1364-1379}, language = {en}, url = {http://dml.mathdoc.fr/item/1183745140} }
Calhoun, William C.; Slaman, Theodore A. The $\Pi^0_2$ Enumeration Degrees are Not Dense. J. Symbolic Logic, Tome 61 (1996) no. 1, pp. 1364-1379. http://gdmltest.u-ga.fr/item/1183745140/