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Submitted on: 19 February 1998.
Revised on: 27 May 1998.
Accepted on: 03 July 1998.
___________________JOURNAL OF CHROMATOGRAPHY A---ELSEVIER
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Submitted on: 18 January 2024.
Revised on: 13 February 2024.
Accepted on: 11 March 2024.
___________________JOURNAL OF CHROMATOGRAPHY A---ELSEVIER
Submitted on: 15 December 2002.
Revised on: 20 January 2003.
Accepted on: 05 February 2003.
___________________JOURNAL OF CHROMATOGRAPHY A---ELSEVIER
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Submitted on: 13 July 2000.
Revised on: 29 September 2000.
Accepted on: 05 November 2000.
___________________JOURNAL OF CHROMATOGRAPHY A---ELSEVIER
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Submitted on: 15 November 1998.
Revised on: 13 February 1999.
Accepted on: 17 March 1999.
___________________JOURNAL OF CHROMATOGRAPHY A---ELSEVIER