Kuo, T.-T.T.-T.KuoSHOU-DE LIN2018-09-102018-09-102011http://www.scopus.com/inward/record.url?eid=2-s2.0-79953050004&partnerID=MN8TOARShttp://scholars.lib.ntu.edu.tw/handle/123456789/365028[SDGs]SDG4Learning-based concept-hierarchy refinement through exploiting topology, content and social informationjournal article10.1016/j.ins.2011.02.006