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Submitted on: 16 November 2001.
Revised on: 29 January 2002.
Accepted on: 28 February 2002.
___________________Jordan Journal of Chemistry---YARMOUK UNIV, DEANSHIP RESEARCH & GRADUATE STUDIES
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Submitted on: 13 August 1998.
Revised on: 17 November 1998.
Accepted on: 02 January 1999.
___________________Jordan Journal of Chemistry---YARMOUK UNIV, DEANSHIP RESEARCH & GRADUATE STUDIES
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Submitted on: 02 June 1999.
Revised on: 19 July 1999.
Accepted on: 19 August 1999.
___________________Jordan Journal of Chemistry---YARMOUK UNIV, DEANSHIP RESEARCH & GRADUATE STUDIES