MathSciNet bibliographic data MR529670 (80f:03053) 03E15 Burgess, John P. Effective enumeration of classes in a \$\Sigma \sp{1}\sb{1}\$$\Sigma \sp{1}\sb{1}$ equivalence relation. Indiana Univ. Math. J. 28 (1979), no. 3, 353–364. Article

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