Dang Van Hung. Specifying Various Time Models with Temporal Propositional Variables in Duration Calculus. In Cliff B. Jones, Zhiming Liu, Jim Woodcock, editors, Formal Methods and Hybrid Real-Time Systems, Essays in Honor of Dines Bjørner and Chaochen Zhou on the Occasion of Their 70th Birthdays, Papers presented at a Symposium held in Macao, China, September 24-25, 2007. Volume 4700 of Lecture Notes in Computer Science, pages 170-187, Springer, 2007. [doi]