1. Andreas Abel and Thorsten Altenkirch. A predicative analysis of structural recursion. Submitted to the Journal of Functional Programming, December 1999.
2. Andreas Abel. A semantic analysis of structural recursion. Master’s thesis, Ludwig-Maximilians-University Munich, 1999. http://www.informatik.uni-muenchen.de/~abel/publications/ .
3. Peter Aczel. Notes on constructive set theory. Available from the WWW, 1997.
4. Thorsten Altenkirch. Constructions, Inductive Types and Strong Normalization. PhD thesis, University of Edinburgh, November 1993.
5. Thorsten Altenkirch. Logical relations and inductive/coinductive types. 1998.