M. Balzer, O. Deussen, and C. Lewerentz. SoftVis '05: Proceedings of the 2005 ACM symposium on Software visualization, page 165--172. ACM Press, (2005)
R. Bencina. NIME '05: Proceedings of the 2005 conference on New interfaces for musical expression, page 101--104. National University of Singapore, (2004)