A. Dattolo, F. Ferrara, and C. Tasso. Proc. of the 3rd International Conference on Human System Interaction - HSI'2010, page 548--555. IEEE Press, (May 2010)
F. Limpens, F. Gandon, and M. Buffa. Automated Software Engineering - Workshops, 2008. ASE Workshops 2008. 23rd IEEE/ACM International Conference on, (September 2008)