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Submitted on: 25 July 1999.
Revised on: 21 September 1999.
Accepted on: 23 October 1999.
___________________JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
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Submitted on: 29 January 1998.
Revised on: 01 May 1998.
Accepted on: 25 May 1998.
___________________JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
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