Received date: 2007-10-08
Revised date: 1900-01-01
Online published: 2008-01-18
Supported by
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Key words: null
YANG Ya-zheng;YANG Jia-ling;FANG Dai-ning . null[J]. Applied Mathematics and Mechanics, 2008 , 29(1) : 51 -60 . DOI: 10.1007/s10483-008-0107-1
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