This author has not been identified. Look up 'Caigui Jiang' in GoogleThis author has not been identified. Look up 'Klara Mundilova' in GoogleThis author has not been identified. Look up 'Florian Rist' in GoogleThis author has not been identified. Look up 'Johannes Wallner' in GoogleThis author has not been identified. Look up 'Helmut Pottmann' in Google