Submitted on: 07 September 1999.
Revised on: 20 October 1999.
Accepted on: 18 November 1999.
___________________Chemosensors---MDPI
Submitted on: 07 September 2006.
Revised on: 11 October 2006.
Accepted on: 03 November 2006.
___________________Chemosensors---MDPI
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Submitted on: 13 October 1998.
Revised on: 29 January 1999.
Accepted on: 15 February 1999.
___________________Chemosensors---MDPI
Submitted on: 15 November 2009.
Revised on: 06 February 2010.
Accepted on: 12 March 2010.
___________________Chemosensors---MDPI
Submitted on: 02 March 2014.
Revised on: 10 April 2014.
Accepted on: 30 April 2014.
___________________Chemosensors---MDPI
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