1. S.J. Bellantoni, Predicative recursion and computational complexity, Ph.D. Thesis, Toronto, September 1993.
2. Predicative recursion and the polytime hierarchy;Bellantoni,1994
3. A new recursion-theoretic characterization of the polytime functions;Bellantoni;Comput. Complexity,1992
4. Ranking primitive recursions;Bellantoni;SIAM J. Comput.,2000
5. Higher type recursion, ramification and polynomial time;Bellantoni;Ann. Pure Appl. Logic,2000