Wu, B.Y.B.Y.WuChao, K.-M.K.-M.ChaoTang, C.Y.C.Y.TangKUN-MA0 CHAO2018-09-102018-09-102000http://www.scopus.com/inward/record.url?eid=2-s2.0-0011243767&partnerID=MN8TOARShttp://scholars.lib.ntu.edu.tw/handle/123456789/289377A Polynomial Time Approximation Scheme for Optimal Product-Requirement Communication Spanning Treesjournal article10.1006/jagm.2000.1088