“Focused Real-Time Systems Monitoring Based on Multiple Anomaly Models” R.J. Doyle, S.A. Chien, U.M. Fayyad & J. Wyatt. QR 1993, Pro. of the 7th International Workshop on Qualitative Reasoning about Physical Systems, pp. 75-82, AAAI Press, Orcas Island, WA, May (1993).