Received date: 2007-01-17
Revised date: 2007-11-12
Online published: 2008-01-18
Supported by
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Key words: null
ZHANG Zhi-guo;LI Jun-feng . null[J]. Applied Mathematics and Mechanics, 2008 , 29(1) : 43 -50 . DOI: 10.1007/s10483-008-0106-x
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