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Submitted on: 16 January 2021.
Revised on: 16 April 2021.
Accepted on: 24 May 2021.
___________________Chemical Bulletin of Kazakh National University
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Submitted on: 11 January 2021.
Revised on: 11 May 2021.
Accepted on: 09 June 2021.
___________________Chemical Bulletin of Kazakh National University
Submitted on: 08 February 2016.
Revised on: 26 March 2016.
Accepted on: 20 April 2016.
___________________Chemical Bulletin of Kazakh National University
Submitted on: 12 July 2008.
Revised on: 29 October 2008.
Accepted on: 08 November 2008.
___________________Chemical Bulletin of Kazakh National University