@inproceedings{, author = {Stefan Ratschan and Jan-Georg Smaus}, title = {Finding Errors of Hybrid Systems by Optimising an Abstraction-Based Quality Estimate}, booktitle = {Tests and Proofs}, pages = {153--168}, year = 2009, editor = {Catherine Dubois}, volume = 5668, series = {LNCS}, publisher = {Springer} }