P. Trezentos, I. Lynce, and A. Oliveira. ASE '10: Proceedings of the IEEE/ACM international conference on Automated software engineering, page 427--436. New York, NY, USA, ACM, (2010)
R. Davoli. ITiCSE '04: Proceedings of the 9th annual SIGCSE conference on Innovation
and technology in computer science education, page 112--116. New York, NY, USA, ACM, (2004)