This author has not been identified. Look up 'Martin R. Albrecht' in GoogleThis author has not been identified. Look up 'Christian Hanser' in GoogleThis author has not been identified. Look up 'Andrea Höller' in GoogleThis author has not been identified. Look up 'Thomas Pöppelmann' in GoogleThis author has not been identified. Look up 'Fernando Virdia' in GoogleThis author has not been identified. Look up 'Andreas Wallner' in Google