1. Provability logic;Artemov,2005
2. Sahlqvist preservation for topological fixed-point logic;Bezhanishvili;J. Log. Comput.,2015
3. Modal Logic;Blackburn,2001
4. On the degree of incompleteness of modal logics;Blok;Bull. Sect. Log.,1978
5. The truth about algorithmic problems in correspondence theory;Chagrov,2006