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Submitted on: 10 August 2004.
Revised on: 16 November 2004.
Accepted on: 12 January 2005.
___________________Chemical Bulletin of Kazakh National University
Submitted on: 18 January 2009.
Revised on: 09 April 2009.
Accepted on: 17 May 2009.
___________________Chemical Bulletin of Kazakh National University
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