1. Modal logics and bounded fragments of predicate logic, Research Report ML-96-03;Andréka,1998
2. Vicious Circles;Barwise,1996
3. Interpolation, preservation, and pebble games, Research Report ML-96-12;Barwise,1998
4. Modal Correspondence Theory;van Benthem,1976
5. The variety of consequence, according to Bolzano;van Benthem;Studia Logica,1985