Submitted on: 08 September 2007.
Revised on: 10 October 2007.
Accepted on: 11 November 2007.
___________________Journal of Modern Dynamics---AMER INST MATHEMATICAL SCIENCES-AIMS
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Submitted on: 23 August 2009.
Revised on: 16 October 2009.
Accepted on: 10 December 2009.
___________________Journal of Modern Dynamics---AMER INST MATHEMATICAL SCIENCES-AIMS
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Submitted on: 29 June 2019.
Revised on: 11 September 2019.
Accepted on: 26 October 2019.
___________________Journal of Modern Dynamics---AMER INST MATHEMATICAL SCIENCES-AIMS
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