This author has not been identified. Look up 'Maarten Kleinhans' in GoogleThis author has not been identified. Look up 'Marc J. van Kreveld' in GoogleThis author has not been identified. Look up 'Tim Ophelders' in GoogleThis author has not been identified. Look up 'Willem Sonke' in GoogleThis author has not been identified. Look up 'Bettina Speckmann' in GoogleThis author has not been identified. Look up 'Kevin Verbeek' in Google