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Submitted on: 09 March 1998.
Revised on: 13 April 1998.
Accepted on: 23 April 1998.
___________________Australasian Journal of Environmental Management
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Submitted on: 17 September 2023.
Revised on: 22 November 2023.
Accepted on: 15 December 2023.
___________________Australasian Journal of Environmental Management