This author has not been identified. Look up 'Bogdan Tofan' in GoogleThis author has not been identified. Look up 'Gerhard Schellhorn' in GoogleThis author has not been identified. Look up 'Gidon Ernst' in GoogleThis author has not been identified. Look up 'Jörg Pfähler' in GoogleThis author has not been identified. It may be one of the following persons: Look up 'Wolfgang Reif' in Google