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Submitted on: 25 December 1999.
Revised on: 26 February 2000.
Accepted on: 01 April 2000.
___________________Bulletin of the University of Karaganda-Chemistry
Submitted on: 24 July 2014.
Revised on: 14 September 2014.
Accepted on: 26 September 2014.
___________________Bulletin of the University of Karaganda-Chemistry
Submitted on: 13 December 2006.
Revised on: 15 March 2007.
Accepted on: 28 April 2007.
___________________Bulletin of the University of Karaganda-Chemistry