Received date: 2007-03-12
Revised date: 2007-11-07
Online published: 2008-02-18
Supported by
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Key words: null
YANG Liu;HE Bin-wu . null[J]. Applied Mathematics and Mechanics, 2008 , 29(2) : 273 -278 . DOI: 10.1007/s10483-008-0215-y
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