This author has not been identified. Look up 'Ingolf Sack' in GoogleThis author has not been identified. Look up 'Bernd Beierbach' in GoogleThis author has not been identified. Look up 'Jens Wuerfel' in GoogleThis author has not been identified. Look up 'Dieter Klatt' in GoogleThis author has not been identified. Look up 'Uwe Hamhaber' in GoogleThis author has not been identified. Look up 'Sebastian Papazoglou' in GoogleThis author has not been identified. Look up 'Peter Martus' in GoogleThis author has not been identified. Look up 'Jürgen Braun' in Google