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Submitted on: 18 September 1998.
Revised on: 22 November 1998.
Accepted on: 01 January 1999.
___________________ACTA PHYSICO-CHIMICA SINICA---PEKING UNIV PRESS
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Submitted on: 19 May 2006.
Revised on: 25 August 2006.
Accepted on: 10 October 2006.
___________________ACTA PHYSICO-CHIMICA SINICA---PEKING UNIV PRESS
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Submitted on: 12 December 2014.
Revised on: 26 February 2015.
Accepted on: 10 April 2015.
___________________ACTA PHYSICO-CHIMICA SINICA---PEKING UNIV PRESS
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