MathSciNet bibliographic data MR519815 03F30 Paris, J. B.; Kirby, L. A. S. \$\Sigma \sb{n}\$$\Sigma \sb{n}$-collection schemas in arithmetic. Logic Colloquium '77 (Proc. Conf., Wrocław, 1977), pp. 199–209, Stud. Logic Foundations Math., 96, North-Holland, Amsterdam-New York, 1978. Links to the journal or article are not yet available

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