Received date: 2007-08-15
Revised date: 2007-12-26
Online published: 2008-02-18
Supported by
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Key words: null
CHEN Yan-mao;LIU Ji-ke . null[J]. Applied Mathematics and Mechanics, 2008 , 29(2) : 199 -206 . DOI: 10.1007/s10483-008-0207-x
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