1. On “provable” analogs of P and NP;Baker;Math. Systems Theory,1979
2. Letter to an infidel mathematician;Berkeley,1951
3. A Constructive Theory of Recursive Functions;Constable,1973
4. On the simplicity of busy beaver sets;Daley;Z. Math. Logik Grundlag. Math.,1978
5. Some connections between mathematical logic and complexity theory;Demillo,1979