1. A final coalgebra theorem;Aczel,1989
2. Terminal coalgebras in well-founded set theory;Barr;Theoret. Sci.,1993
3. J. Barwise, L. Moss, Vicious Circles: On the Mathematics of Non-wellfounded Phenomena, CSLI Lecture Notes, vol. 60, CSLI, 1996.
4. A complete calculus for equational deduction in coalgebraic specification, Report SEN-R9723;Corradini,1997
5. R. Goldblatt, Logics of time and computation, CSLI Lecture Notes, vol. 7, CSLI, 1987.