I. Kurtev, J. Bézivin, F. Jouault, and P. Valduriez. OOPSLA '06: Companion to the 21st ACM SIGPLAN Symposium on Object-oriented Programming Systems, Languages, and Applications, Portland, OR, USA, page 602-616. (2006)
L. Hong, E. Chi, R. Budiu, P. Pirolli, and L. Nelson. Proceedings of the Working Conference on Advanced Visual Interfaces (AVI '08), Napoli, Italy, page 65-72. (2008)