Symposium on Electromagnetic Phenomena in Nonlinear Circuits 2004", "Selected Papers from 18th Symposium on Electromagnetic Phenomena in Nonlinear Circuits 2004. the International Journal for Computation and Mathematics in Electrical and Electronic Engineering, Volume 25, Issue 1" and "Selected Papers from the 6th International Symposium on Electric and Magnetic Fields (EMF) 2003 Aachen Germany. Compel"