U. Schmid:
"Monitoring of Distributed Real-Time Systems";
Talk: Real time computing, NATO ASI Series F: Computer and Systems Sciences, Sint Maarten; 1994; in: "Proc. NATO ASI on Real-Time Computing", 127 (1994), 582 - 583.
http://www.ecs.tuwien.ac.at/~s/Mypapers/S11.pdf