This author has not been identified. Look up 'Mao Jia-Fa' in GoogleThis author has not been identified. Look up 'Xin-Xin Niu' in GoogleThis author has not been identified. Look up 'Xiao Gang' in GoogleThis author has not been identified. Look up 'Sheng Wei-Guo' in GoogleThis author has not been identified. Look up 'Zhang Na-Na' in Google