The original version of the article was published in Central European Journal of Chemistry, 2008, 7(4), 870–875, DOI: 10.2478/s11532-009-0091-2. Unfortunately, the original version of this article contains mistakes in the date section. There should be: received 13 February 2009, accepted 24 May 2009.
Faculty of Industrial Education, Beni Suef University, 62511, Beni Suef, Egypt
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