MING-CHANG KANG2018-09-102018-09-102012http://www.scopus.com/inward/record.url?eid=2-s2.0-80855143690&partnerID=MN8TOARShttp://scholars.lib.ntu.edu.tw/handle/123456789/369598Retract rational fieldsjournal article10.1016/j.jalgebra.2011.10.024