1. Linear reasoning. A new form of the Herbrand-Gentzen theorem;Craig, William;J. Symbolic Logic,1957
2. 2. S. Feferman, Some extensions of the interpolation lemma to many-sorted and infinitary logics (to appear).
3. Set theoretic problems suggested by the notion of potential totality.;Kreisel, G.,1961
4. Metarecursive sets;Kreisel, G.;J. Symbolic Logic,1965