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Submitted on: 02 June 1999.
Revised on: 02 September 1999.
Accepted on: 30 September 1999.
___________________JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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Submitted on: 07 May 2001.
Revised on: 13 June 2001.
Accepted on: 20 July 2001.
___________________JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY