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2. The monadic second order theory of ω1;Büchi,1973
3. Theories of atomata on ω-tapes: A simplified approach;Choueka;J. Comput. System Sci.,1974
4. Application of games to the completeness problem for formalized theories;Ehrenfeucht;Fund. Math.,1961
5. A Mathematical Introduction to Logic;Enderton,1972