Li, H., Olver, P. J., & Sommer, G. (2005). Computer algebra and geometric algebra with applications: 6th International Workshop, IWMM 2004, Shanghai, China, May 19-21, 2004 and International Workshop, GIAE 2004, Xian, China, May 24-28, 2004.Revised Selected Paper. Springer-Verlag.

Li, Hongbo, Peter J. Olver, and Gerald Sommer. Computer Algebra and Geometric Algebra with Applications: 6th International Workshop, IWMM 2004, Shanghai, China, May 19-21, 2004 and International Workshop, GIAE 2004, Xian, China, May 24-28, 2004.Revised Selected Paper. Berlin Heidelberg: Springer-Verlag, 2005.

Li, Hongbo, et al. Computer Algebra and Geometric Algebra with Applications: 6th International Workshop, IWMM 2004, Shanghai, China, May 19-21, 2004 and International Workshop, GIAE 2004, Xian, China, May 24-28, 2004.Revised Selected Paper. Springer-Verlag, 2005.