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"On the decision problem for two-variable first-order logic."
Erich Grädel, Phokion G. Kolaitis, Moshe Y. Vardi (1997)
- Erich Grädel, Phokion G. Kolaitis, Moshe Y. Vardi:
On the decision problem for two-variable first-order logic. Bull. Symb. Log. 3(1): 53-69 (1997)

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