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Submitted on: 06 July 2001.
Revised on: 23 August 2001.
Accepted on: 13 September 2001.
___________________JOURNAL OF MOLECULAR LIQUIDS---ELSEVIER
Submitted on: 11 September 1999.
Revised on: 20 December 1999.
Accepted on: 08 February 2000.
___________________JOURNAL OF MOLECULAR LIQUIDS---ELSEVIER
Submitted on: 13 May 2011.
Revised on: 28 June 2011.
Accepted on: 04 August 2011.
___________________JOURNAL OF MOLECULAR LIQUIDS---ELSEVIER