1. Modal languages and bounded fragments of predicate logic;Andréka;ILLC Research Report ML-96-03,1996
2. Structural Complexity II;Balcázar,1990
3. Modal Logic an Classical Logic;Van Benthem,1983
4. Exploring Logical Dynamics;Van Benthem,1996
5. Dynamic bits and pieces;Van Benthem;ILLC Research Report,1997