Affiliation: | a Vakgroep Elektrische Energietechniek, Universiteit Gent, Zwijnaarde 9, 9052 Gent, Belgium;b School of Mathematics and Statistics, Curtin University of Technology, GPO Box U 1987, Perth WA 6845, Australia;c Department of Applied Mathematics and Computer Science, University of Gent, Krijgslaan 281-59, B-9000, Gent, Belgium |