[IEEE 1980 19th IEEE Conference on Decision and Control including the Symposium on Adaptive Processes - Albuquerque, NM, USA (1980.12.10-1980.12.12)] 1980 19th IEEE Conference on Decision and Control including the Symposium on Adaptive Processes - Computing co-state variables for discrete event systemsHo, Y.; Cassandras, C. · 1980