T. Alspaugh, D. Richardson, и T. Standish. 4th International Workshop on Scenarios and State Machines: Models, Algorithms and Tools (SCESM'05), стр. 1--5. St. Louis, MI, (мая 2005)
J. Whittle, и J. Schumann. ICSE '00: Proceedings of the 22nd international conference on Software engineering, стр. 314--323. New York, NY, USA, ACM Press, (2000)