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Submitted on: 22 January 2012.
Revised on: 29 April 2012.
Accepted on: 11 June 2012.
___________________ANALYTICAL LETTERS---TAYLOR & FRANCIS INC
Submitted on: 21 July 2003.
Revised on: 13 November 2003.
Accepted on: 07 December 2003.
___________________ANALYTICAL LETTERS---TAYLOR & FRANCIS INC