Bemporad, Alberto and Giorgetti, Nicolò and Kolmanovsky, Ilya and Hrovat, Davor  Hybrid modeling and control of a direct injection stratified charge engine.   In:  Symposium on Advanced Automotive Technologies, ASME International Mechanical Engineering Congress an.   ASME, pp. 691-698.  ISBN 0-7918-3629-0       (2002)