MathSciNet bibliographic data MR1117216 (93a:03044) 03D25 (03C62 03F30) Chong, C. T.; Mourad, K. J. \$\Sigma\sb n\$$\Sigma\sb n$ definable sets without \$\Sigma\sb n\$$\Sigma\sb n$ induction. Trans. Amer. Math. Soc. 334 (1992), no. 1, 349–363. Article

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