1. Lect Notes Comput Sci;R. Alur,1999
2. Arnold A.: An extension of the notion of traces and asynchronous automata. Theoretical Informatics and Applications 25 (1991) 355–393
3. Technical report;H. Ben-Abdallah,1996
4. Lect Notes Comput Sci;H. Ben-Abdallah,1997
5. Booch G., Jacobson I. and Rumbough J.: Unified Modelling Language User Guide. (Addison-Wesley, 1997)