Alur R, Courcoubetis C, Henzinger TA, Ho P, Nicollin X, Olivero A, Sifakis J, Yovine S. 1994. The algorithmic analysis of hybrid systems. 11th International Conference on Analysis and Optimization of Systems Discrete Event Systems. ICAOS: Analysis and Optimization of Systems - Discrete-Event Systems, LNCIS, vol. 199, 331–351.