This author has not been identified. Look up 'Thomas R. Jefferson' in GoogleThis author has not been identified. Look up 'M. Beckmann' in GoogleThis author has not been identified. Look up 'D. W. Peterson' in GoogleThis author has not been identified. Look up 'Jochen Wilhelm' in GoogleThis author has not been identified. Look up 'M. Kraft' in GoogleThis author has not been identified. Look up 'Bernd Schiemenz' in GoogleThis author has not been identified. Look up 'P. de Boer' in GoogleThis author has not been identified. Look up 'J. van Daal' in GoogleThis author has not been identified. Look up 'J. Telgen' in GoogleThis author has not been identified. Look up 'C. Becker' in GoogleThis author has not been identified. Look up 'Johannes Jahn' in Google