GERARD JENNHWA CHANG2018-09-102018-09-101991http://www.scopus.com/inward/record.url?eid=2-s2.0-0042915670&partnerID=MN8TOARShttp://scholars.lib.ntu.edu.tw/handle/123456789/291982Centers of chordal graphsjournal article10.1007/BF01787637