A.  Balluchi, Bicchi, A., Caterini, C., Rossi, C., and Sangiovanni-Vincentelli, A. L., ?Hybrid Tracking Control for Spark-Ignition Engines?, in Proc. 39th IEEE Conference on Decision and Control, Sydney, NSW, Australia, 2000, vol. 4, pp. 3126-31. 

A.  Balluchi, Bicchi, A., Padroni, G., Rossi, C., and Sangiovanni-Vincentelli, A. L., ?Hybrid Optimization Problems in Automotive Applications?, in Proc. IFAC International Workshop on Motion Control, Grenoble, France, 1998, pp. 273-278.