[1] Department of Applied Mathematics, Biometrics and Process Control, Ghent University, Coupure links 653, B-9000 Gent, Belgium
[2] Department of Applied Mathematics and Computer Science, Ghent University, Krijgslaan 281 (S9), B-9000 Gent, Belgium
[3] Hogeschool Gent, Schoonmeersstraat 52, B-9000 Gent, Belgium