This author has not been identified. Look up 'Hans-Wilhelm Rühl' in GoogleThis author has not been identified. Look up 'S. Dobler' in GoogleThis author has not been identified. Look up 'J. Weith' in GoogleThis author has not been identified. Look up 'Peter Meyer' in GoogleThis author has not been identified. Look up 'Andreas Noll' in GoogleThis author has not been identified. Look up 'Hans-Hermann Hamer' in GoogleThis author has not been identified. Look up 'H. Piotrowski' in Google