Submitted on: 12 March 2001.
Revised on: 05 April 2001.
Accepted on: 29 April 2001.
___________________JOURNAL OF PALEOLIMNOLOGY---SPRINGER
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Submitted on: 31 March 2005.
Revised on: 09 June 2005.
Accepted on: 12 July 2005.
___________________JOURNAL OF PALEOLIMNOLOGY---SPRINGER
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