Submitted on: 15 January 2018.
Revised on: 13 April 2018.
Accepted on: 04 May 2018.
___________________CHINESE ANNALS OF MATHEMATICS SERIES B
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Submitted on: 20 May 2018.
Revised on: 03 July 2018.
Accepted on: 09 August 2018.
___________________CHINESE ANNALS OF MATHEMATICS SERIES B
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Submitted on: 23 July 2004.
Revised on: 17 November 2004.
Accepted on: 08 January 2005.
___________________CHINESE ANNALS OF MATHEMATICS SERIES B
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Submitted on: 05 September 2008.
Revised on: 27 December 2008.
Accepted on: 09 January 2009.
___________________CHINESE ANNALS OF MATHEMATICS SERIES B