This author has not been identified. Look up 'Wolfgang Eßmayr' in GoogleThis author has not been identified. Look up 'Elisabeth Kapsammer' in GoogleThis author has not been identified. It may be one of the following persons: Look up 'Roland Wagner' in GoogleThis author has not been identified. Look up 'Günther Pernul' in GoogleThis author has not been identified. Look up 'A. Min Tjoa' in Google