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Submitted on: 22 June 2006.
Revised on: 21 August 2006.
Accepted on: 13 September 2006.
___________________Eurasian Chemico-Technological Journal
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Submitted on: 31 December 2006.
Revised on: 26 January 2007.
Accepted on: 02 March 2007.
___________________Eurasian Chemico-Technological Journal
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Submitted on: 18 December 2017.
Revised on: 02 February 2018.
Accepted on: 22 March 2018.
___________________Eurasian Chemico-Technological Journal
Submitted on: 14 August 2012.
Revised on: 06 December 2012.
Accepted on: 15 January 2013.
___________________Eurasian Chemico-Technological Journal
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