1. D. Alton, "Natural" complexity measures and a subrecursive speed-up theorem, to appear, Proceedings of IFIP Congress '77, Toronto, Canada, August, 1977.
2. Computer Science report;D. Alton,1976
3. D. Alton, Are there lots of "natural" subrecursive programming languages and complexity measures?, in preparation.
4. D. Alton, Nonexistence of program optimizers in several abstract settings, J. Comput. System Sci. 12(1976), 368–393.
5. D. Alton and J. Lowther, Nonexistence of program optimizers: subrecursive languages and "natural" complexity measures, in preparation.