J. Hausmann, and S. Kent. SoftVis '03: Proceedings of the 2003 ACM symposium on Software visualization, page 169--178. New York, NY, USA, ACM Press, (2003)
E. Börger, A. Cavarra, and E. Riccobene. SAC '03: Proceedings of the 2003 ACM symposium on Applied computing, page 1086--1091. New York, NY, USA, ACM, (2003)
J. Hausmann, and S. Kent. SoftVis '03: Proceedings of the 2003 ACM symposium on Software visualization, page 169--178. New York, NY, USA, ACM Press, (2003)