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Submitted on: 22 April 2001.
Revised on: 30 April 2001.
Accepted on: 20 May 2001.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
Submitted on: 11 August 2005.
Revised on: 24 September 2005.
Accepted on: 16 October 2005.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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