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Submitted on: 02 February 2006.
Revised on: 20 May 2006.
Accepted on: 28 June 2006.
___________________Boundary Value Problems---SPRINGER
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Submitted on: 10 January 2021.
Revised on: 30 April 2021.
Accepted on: 11 May 2021.
___________________Boundary Value Problems---SPRINGER
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http://reply.papertrans.cn/1/41/4060/4060-17.png
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