Marek Jersak Ying Cai Dirk Ziegenbein Rolf Ernst A Transformational Approach to Constraint Relaxation of a Time-driven Simulation Model. 137-142 2000 ISSS http://doi.ieeecomputersociety.org/10.1109/ISSS.2000.874040 db/conf/isss/isss2000.html#JersakCZE00