Heinrich Rust. A Non-standard Approach to Operational Semantics for Timed Systems. In Egon Börger, Angelo Gargantini, Elvinia Riccobene, editors, Abstract State Machines, Advances in Theory and Practice, 10th International Workshop, ASM 2003, Taormina, Italy, March 3-7, 2003, Proceedings. Volume 2589 of Lecture Notes in Computer Science, pages 423-424, Springer, 2003. [doi]