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Submitted on: 18 October 2004.
Revised on: 31 December 2004.
Accepted on: 15 January 2005.
___________________Journal of Modern Dynamics---AMER INST MATHEMATICAL SCIENCES-AIMS
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Submitted on: 20 July 2008.
Revised on: 18 October 2008.
Accepted on: 09 November 2008.
___________________Journal of Modern Dynamics---AMER INST MATHEMATICAL SCIENCES-AIMS