@INPROCEEDINGS{halbwachs94b,
AUTHOR={N. Halbwachs and Y.-E. Proy and P. Raymond},
TITLE={Verification of linear hybrid systems by means of
convex approximations},
BOOKTITLE={International Static Analysis Symposium, SAS'94},
ADDRESS={Namur (Belgium)},
MONTH={September},
YEAR= 1994
}