Submitted on: 16 October 2008.
Revised on: 25 October 2008.
Accepted on: 11 November 2008.
Macedonian Journal of Chemistry and Chemical engineering
Submitted on: 01 March 1998.
Revised on: 10 April 1998.
Accepted on: 24 April 1998.
Macedonian Journal of Chemistry and Chemical engineering
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Submitted on: 02 September 2019.
Revised on: 15 September 2019.
Accepted on: 13 October 2019.
Macedonian Journal of Chemistry and Chemical engineering