W. Hafla, F. Groh, A. Buchau, and W. Rucker. Proceedings of the 11th International IGTE Symposium on Numerical Field Calculation in Electrical Engineering, Graz, (2004)
R. Leine, and C. Glocker. Proceedings of the Design Engineering Technical Conferences & Computers and Information in Engineering Conference (DETC 2003), ASME Symposium on Nonlinear Dynamics In Engineering Systems, Chicago, USA, (September 2003)