Submitted on: 23 September 2004.
Revised on: 19 January 2005.
Accepted on: 23 February 2005.
___________________CHINESE PHYSICS LETTERS---IOP PUBLISHING LTD
Submitted on: 08 December 1998.
Revised on: 27 January 1999.
Accepted on: 23 March 1999.
___________________CHINESE PHYSICS LETTERS---IOP PUBLISHING LTD
Submitted on: 04 January 2016.
Revised on: 08 April 2016.
Accepted on: 03 June 2016.
___________________CHINESE PHYSICS LETTERS---IOP PUBLISHING LTD
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Submitted on: 30 March 2000.
Revised on: 25 July 2000.
Accepted on: 03 September 2000.
___________________CHINESE PHYSICS LETTERS---IOP PUBLISHING LTD