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Submitted on: 09 January 2007.
Revised on: 17 February 2007.
Accepted on: 05 April 2007.
___________________EGYPTIAN JOURNAL OF CHEMISTRY---NATIONAL INFORMATION & DOCUMENTATION CENTRE-NIDOC
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Submitted on: 18 September 2021.
Revised on: 26 October 2021.
Accepted on: 28 November 2021.
___________________EGYPTIAN JOURNAL OF CHEMISTRY---NATIONAL INFORMATION & DOCUMENTATION CENTRE-NIDOC
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