Submitted on: 07 May 2010.
Revised on: 22 July 2010.
Accepted on: 19 August 2010.
___________________Bulletin of the University of Karaganda-Chemistry
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Submitted on: 15 February 2008.
Revised on: 11 March 2008.
Accepted on: 08 April 2008.
___________________Bulletin of the University of Karaganda-Chemistry
Submitted on: 19 November 2020.
Revised on: 21 December 2020.
Accepted on: 17 January 2021.
___________________Bulletin of the University of Karaganda-Chemistry
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Submitted on: 27 April 2013.
Revised on: 23 May 2013.
Accepted on: 27 June 2013.
___________________Bulletin of the University of Karaganda-Chemistry
Submitted on: 30 January 2004.
Revised on: 27 May 2004.
Accepted on: 22 July 2004.
___________________Bulletin of the University of Karaganda-Chemistry
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