XIAO-GANG HEMa, B.-Q.B.-Q.Ma2018-09-102018-09-102011http://www.scopus.com/inward/record.url?eid=2-s2.0-80053484101&partnerID=MN8TOARShttp://scholars.lib.ntu.edu.tw/handle/123456789/365697journal article10.1142/S02177323110365772-s2.0-80053484101