| 1998 | ||
|---|---|---|
| 2 | Seema Ahmad, Alistair H. Lachlan: Some Special Pairs Of Sigma2 e-Degrees. Math. Log. Q. 44: 431-449 (1998) | |
| 1991 | ||
| 1 | Seema Ahmad: Embedding the Diamond in the Sigma2 Enumeration Degrees. J. Symb. Log. 56(1): 195-212 (1991) | |
| 1 | Alistair H. Lachlan | [2] |