HUAH CHU2018-09-102018-09-101984http://www.scopus.com/inward/record.url?eid=2-s2.0-0011682052&partnerID=MN8TOARShttp://scholars.lib.ntu.edu.tw/handle/123456789/306851On the GE2 of graded ringsjournal article10.1016/0021-8693(84)90207-2