Henzinger, T. A., Horowitz, B., Majumdar, R., &; Wong Toi, H. (2000). Beyond HyTech: Hybrid systems analysis using interval numerical methods. In Proceedings of the 3rd International Workshop on Hybrid Systems (Vol. 1790, pp. 130–144). Pittsburgh, PA, USA: Springer.https://doi.org/10.1007/3-540-46430-1_14 

Henzinger, T. A., &; Raskin, J. (2000). Robust undecidability of timed and hybrid systems. In Proceedings of the 3rd International Workshop on Hybrid Systems (Vol. 1790, pp. 145–159). Pittsburgh, PA, USA: Springer.https://doi.org/10.1007/3-540-46430-1_15