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易 斌 1,李荣珩 2
Several progress about approximation algorithm for k-PUFLPN
YI Bin 1,Li Rong-heng 2
计算机工程与应用 . 2009, (17): 221 -224 .  DOI: 10.3778/j.issn.1002-8331.2009.17.067