D. Wagelaar, and V. Jonckers. Proceedings of the 8th international conference on Model Driven Engineering Languages and Systems, page 367--381. Berlin, Heidelberg, Springer-Verlag, (2005)
A. Ko, and B. Myers. Journal of Visual Languages & Computing, 16 (1-2):
41 - 84(2005)<ce:title>2003 IEEE Symposium on Human Centric Computing Languages and Environments</ce:title>.
D. Schreiner, and K. Goschka. Proceedings of the 31st Annual International Computer Software and Applications Conference - Volume 02, page 635--641. Washington, DC, USA, IEEE Computer Society, (2007)