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Submitted on: 30 August 1998.
Revised on: 06 November 1998.
Accepted on: 07 December 1998.
___________________Enterprise Modelling and Information Systems Architectures-An International Journal
Submitted on: 18 March 2007.
Revised on: 10 April 2007.
Accepted on: 18 May 2007.
___________________Enterprise Modelling and Information Systems Architectures-An International Journal