http://reply.papertrans.cn/1/61/6012/6012-11.png
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http://reply.papertrans.cn/1/61/6012/6012-13.png
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http://reply.papertrans.cn/1/61/6012/6012-19.png
Submitted on: 06 March 2009.
Revised on: 16 May 2009.
Accepted on: 30 May 2009.
___________________COMMUNICATIONS IN MATHEMATICAL PHYSICS