This author has not been identified. Look up 'Simon Spelthann' in GoogleThis author has not been identified. Look up 'Stefanie Unland' in GoogleThis author has not been identified. Look up 'Jonas Thiem' in GoogleThis author has not been identified. Look up 'Florian Jakobs' in GoogleThis author has not been identified. Look up 'Jana Kielhorn' in GoogleThis author has not been identified. Look up 'Pen Yiao Ang' in GoogleThis author has not been identified. Look up 'Hans-Hermann Johannes' in GoogleThis author has not been identified. Look up 'Dietmar Kracht' in GoogleThis author has not been identified. Look up 'Jörg Neumann' in GoogleThis author has not been identified. Look up 'Axel Rühl' in GoogleThis author has not been identified. Look up 'Wolfgang Kowalsky' in GoogleThis author has not been identified. Look up 'Detlev Ristau' in Google