Submitted on: 19 February 2002.
Revised on: 21 April 2002.
Accepted on: 26 May 2002.
___________________JOURNAL OF THE SERBIAN CHEMICAL SOCIETY
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Submitted on: 02 July 2009.
Revised on: 07 September 2009.
Accepted on: 31 October 2009.
___________________JOURNAL OF THE SERBIAN CHEMICAL SOCIETY