This author has not been identified. Look up 'Stefan Dietzel' in GoogleThis author has not been identified. Look up 'Elmar Schoch' in GoogleThis author has not been identified. Look up 'Bastian Könings' in GoogleThis author has not been identified. Look up 'Michael Weber' in GoogleThis author has not been identified. It may be one of the following persons: Look up 'Frank Kargl' in Google