Submitted on: 17 February 2017.
Revised on: 21 March 2017.
Accepted on: 04 April 2017.
Macedonian Journal of Chemistry and Chemical engineering
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Submitted on: 22 January 1998.
Revised on: 05 March 1998.
Accepted on: 17 March 1998.
Macedonian Journal of Chemistry and Chemical engineering
Submitted on: 20 November 2011.
Revised on: 07 December 2011.
Accepted on: 23 December 2011.
Macedonian Journal of Chemistry and Chemical engineering