1. Lect Notes Comput Sci;M. Bojańczyk,2001
2. A. Saoudi D. E. Muller and P. E. Shupp. Weak alternating automata give a simple explanation why most temporal and dynamic logics are decidable in exponential time. In Proceedings 3rd IEEE Symposium on Logic in Computer Science, pages 422–427, 1988.
3. E. A. Emerson and C. Jutla. Tree automata, mu-calculus and determinacy. In Proc. 32th IEEE Symposium on Foundations of Computer Science, pages 368–377, 1991.
4. E. Grädel. On the restraining power of guards. Journal of Symbolic Logic, 1999.
5. E. Grädel and I. Walukiewicz. Guarded fixed point logic. In Proceedings 14th IEEE Symp. on Logic in Computer Science, pages 45–54, 1999.