John N. Crossley. Recursive equivalence: a survey. Proceedings of the summer school in logic, Leeds, 1967, edited by M. H. Löb, Lecture notes in mathematics, no. 70, Springer-Verlag, Berlin, Heidelberg, and New York, 1968, pp. 241–251. - John N. Crossley. Recursive equivalence. The bulletin of the London Mathematical Society, vol. 2 (1970), pp. 129–151.
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