Submitted on: 11 September 2006.
Revised on: 15 October 2006.
Accepted on: 02 November 2006.
___________________JOURNAL OF FLUORESCENCE---SPRINGER/PLENUM PUBLISHERS
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Submitted on: 08 November 2020.
Revised on: 23 January 2021.
Accepted on: 13 March 2021.
___________________JOURNAL OF FLUORESCENCE---SPRINGER/PLENUM PUBLISHERS
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Submitted on: 25 March 1998.
Revised on: 21 April 1998.
Accepted on: 10 June 1998.
___________________JOURNAL OF FLUORESCENCE---SPRINGER/PLENUM PUBLISHERS
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