| |
| 1989 | ||
|---|---|---|
| 3 | Galen Weitkamp: The Sigma12 Theory of Axioms of Symmetry. J. Symb. Log. 54(3): 727-734 (1989) | |
| 1983 | ||
| 2 | Stephen G. Simpson, Galen Weitkamp: High and Low Kleene Degrees of Coanalytic Sets. J. Symb. Log. 48(2): 356-368 (1983) | |
| 1982 | ||
| 1 | Galen Weitkamp: Analytic Sets Having Incomparable Kleene Degrees. J. Symb. Log. 47(4): 860-868 (1982) | |
| 1 | Stephen G. Simpson | [2] |