Rectangular hybrid games
T.A. Henzinger, B. Horowitz, R. Majumdar, in:, Proceedings of the 10th International Conference on Concurrency Theory, Schloss Dagstuhl - Leibniz-Zentrum für Informatik, 1999, pp. 320–335.

Automating modular verification
R. Alur, L. De Alfaro, T.A. Henzinger, F. Mang, in:, Proceedings of the 10th International Conference on Concurrency Theory, Schloss Dagstuhl - Leibniz-Zentrum für Informatik, 1999, pp. 82–97.