This author has not been identified. Look up 'Zhengwei Xie' in GoogleThis author has not been identified. Look up 'Daowen Qiu' in GoogleThis author has not been identified. Look up 'Guangya Cai' in GoogleThis author has not been identified. Look up 'Jozef Gruska' in GoogleThis author has not been identified. Look up 'Paulo Mateus' in Google