M. A, F. Fracchia, and H. Mueller. WPC '97: Proceedings of the 5th International Workshop on Program Comprehension (WPC '97), Washington, DC, USA, IEEE Computer Society, (1997)
T. Green. Proceedings of the fifth conference of the British Computer Society, Human-Computer Interaction Specialist Group on People and computers V, page 443--460. New York, NY, USA, Cambridge University Press, (1989)