1. A final coalgebra theorem;Aczel,1989
2. F. Bartels, On generalised coinduction and probabilistic specification formats, Ph.D. Thesis, CWI, Amsterdam, 2004
3. A hierarchy of probabilistic system types;Bartels,2003
4. Modal Logic;Blackburn,2000
5. On expressivity and compositionality in logics for coalgebras;Cǐrstea,2003