Submitted on: 02 March 1998.
Revised on: 01 June 1998.
Accepted on: 12 July 1998.
___________________Inland Water Biology---MAIK NAUKA/INTERPERIODICA/SPRINGER
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Submitted on: 24 June 2013.
Revised on: 07 September 2013.
Accepted on: 19 September 2013.
___________________Inland Water Biology---MAIK NAUKA/INTERPERIODICA/SPRINGER
Submitted on: 27 May 2012.
Revised on: 04 August 2012.
Accepted on: 20 September 2012.
___________________Inland Water Biology---MAIK NAUKA/INTERPERIODICA/SPRINGER
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