This author has not been identified. Look up 'Houari Sabirin' in GoogleThis author has not been identified. Look up 'Qiang Yao' in GoogleThis author has not been identified. Look up 'Keisuke Nonaka' in GoogleThis author has not been identified. Look up 'Hiroshi Sankoh' in GoogleThis author has not been identified. Look up 'Sei Naito' in Google