Submitted on: 06 April 2003.
Revised on: 01 May 2003.
Accepted on: 20 May 2003.
___________________Fire-Switzerland---MDPI
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Submitted on: 21 March 2017.
Revised on: 01 June 2017.
Accepted on: 19 July 2017.
___________________Fire-Switzerland---MDPI
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