This author has not been identified. Look up 'Christoph Hübel' in GoogleThis author has not been identified. Look up 'Bernhard Mitschang' in GoogleThis author has not been identified. Look up 'Michael Gesmann' in GoogleThis author has not been identified. Look up 'Andreas Grasnickel' in GoogleThis author has not been identified. Look up 'Wolfgang Käfer' in GoogleThis author has not been identified. Look up 'Harald Schöning' in GoogleThis author has not been identified. Look up 'Theo Härder' in Google