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  1. A spectrum hierarchy.Ronald Fagin - 1975 - Mathematical Logic Quarterly 21 (1):123-134.
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  • Theory of Formal Systems.Raymond M. Smullyan - 1965 - Journal of Symbolic Logic 30 (1):88-90.
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  • (1 other version)Concatenation as a basis for arithmetic.W. V. Quine - 1946 - Journal of Symbolic Logic 11 (4):105-114.
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  • (1 other version)Weak Second‐Order Arithmetic and Finite Automata.J. Richard Büchi - 1960 - Mathematical Logic Quarterly 6 (1-6):66-92.
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