XIAO-GANG HE2018-09-102018-09-102009http://www.scopus.com/inward/record.url?eid=2-s2.0-71249117302&partnerID=MN8TOARShttp://scholars.lib.ntu.edu.tw/handle/123456789/351129Penguin and box diagrams in unitary gaugejournal article10.1140/epjc/s10052-009-1162-42-s2.0-71249117302WOS:000272803600011