1. ∑n-Collection Schemas in Arithmetic
2. A Mathematical Incompleteness in Peano Arithmetic
3. Mills G. , Extensions of models of Peano arithmetic, Ph.D. dissertation, University of California, Berkeley, California, 1977.
4. Kirby L. , Initial segments of models of arithmetic, Ph.D. dissertation, University of Manchester, Manchester, 1977.
5. Bennett J. , On spectra, Ph.D. dissertation, Princeton University, Princeton, N.J., 1962.