A. van Deursen, and L. Moonen. Proc. Int'l Conf. eXtreme Programming and Flexible Processes in Software Engineering (XP), page 71--76. (2002)Alghero, Sardinia, Italy.
T. Alspaugh, D. Richardson, and T. Standish. 4th International Workshop on Scenarios and State Machines: Models, Algorithms and Tools (SCESM'05), page 1--5. St. Louis, MI, (May 2005)