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Submitted on: 20 October 2016.
Revised on: 14 February 2017.
Accepted on: 16 March 2017.
___________________CHINESE PHYSICS LETTERS---IOP PUBLISHING LTD
Submitted on: 27 March 2021.
Revised on: 20 May 2021.
Accepted on: 18 June 2021.
___________________CHINESE PHYSICS LETTERS---IOP PUBLISHING LTD
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Submitted on: 20 November 2002.
Revised on: 21 February 2003.
Accepted on: 31 March 2003.
___________________CHINESE PHYSICS LETTERS---IOP PUBLISHING LTD
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