darker50 发表于 2012-5-3 15:31+ ^' }& p# |6 K+ R" r9 s# j9 L
《离散数学及其应用》电子版) c2 v" Z- b* ]# B
http://www.madio.net/forum.php?mod=viewthread&tid=140882&fromuid=343071: @$ q% V5 d' h# M. q
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