Lee, T.-K.T.-K.LeeTSIU-KWEN LEE2019-10-282019-10-282004https://scholars.lib.ntu.edu.tw/handle/123456789/428655[SDGs]SDG4Left annihilators characterized by differential identitiesconference paper10.1017/S00130915030000872-s2.0-3142663292https://www.scopus.com/inward/record.uri?eid=2-s2.0-3142663292&doi=10.1017%2fS0013091503000087&partnerID=40&md5=cb54bf6d20a8d70335d95b372ebfe4c6