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Submitted on: 07 July 2009.
Revised on: 30 July 2009.
Accepted on: 09 September 2009.
___________________Journal of Sensors---HINDAWI LTD
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Submitted on: 17 February 1998.
Revised on: 20 March 1998.
Accepted on: 25 April 1998.
___________________Journal of Sensors---HINDAWI LTD
Submitted on: 25 January 2004.
Revised on: 29 February 2004.
Accepted on: 11 March 2004.
___________________Journal of Sensors---HINDAWI LTD