1998 | ||
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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] |