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Submitted on: 24 July 2000.
Revised on: 01 November 2000.
Accepted on: 30 November 2000.
___________________Chemistry Africa-A Journal of the Tunisian Chemical Society
Submitted on: 12 March 2000.
Revised on: 21 May 2000.
Accepted on: 19 July 2000.
___________________Chemistry Africa-A Journal of the Tunisian Chemical Society
Submitted on: 20 August 2011.
Revised on: 12 September 2011.
Accepted on: 18 October 2011.
___________________Chemistry Africa-A Journal of the Tunisian Chemical Society
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Submitted on: 09 July 2017.
Revised on: 26 August 2017.
Accepted on: 26 September 2017.
___________________Chemistry Africa-A Journal of the Tunisian Chemical Society
Submitted on: 10 February 2002.
Revised on: 08 March 2002.
Accepted on: 27 March 2002.
___________________Chemistry Africa-A Journal of the Tunisian Chemical Society
Submitted on: 30 July 2017.
Revised on: 19 September 2017.
Accepted on: 02 October 2017.
___________________Chemistry Africa-A Journal of the Tunisian Chemical Society
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