MathSciNet bibliographic data MR1217184 (94d:03084) 03D30 Jockusch, Carl G., Jr.; Slaman, Theodore A. On the \$\Sigma\sb 2\$$\Sigma\sb 2$-theory of the upper semilattice of Turing degrees. J. Symbolic Logic 58 (1993), no. 1, 193–204. Article

For users without a MathSciNet license , Relay Station allows linking from MR numbers in online mathematical literature directly to electronic journals and original articles. Subscribers receive the added value of full MathSciNet reviews.