Submitted on: 01 August 1999.
Revised on: 30 September 1999.
Accepted on: 20 November 1999.
___________________BIOCHEMICAL SYSTEMATICS AND ECOLOGY
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Submitted on: 16 October 2001.
Revised on: 07 December 2001.
Accepted on: 09 January 2002.
___________________BIOCHEMICAL SYSTEMATICS AND ECOLOGY
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Submitted on: 19 June 2002.
Revised on: 28 July 2002.
Accepted on: 19 August 2002.
___________________BIOCHEMICAL SYSTEMATICS AND ECOLOGY