Affiliation: | 1. Science and Technology Department, Pacific Bell, 94583, San Ramon, California 2. Centre for Applied Statistics and Systems Modelling School of Mathematics, University of Greenwich, Wellington Street, SEI8 6PF, Woolwich London, UK 3. Systems Department, The Open University, Walton Hall, MK7 6AA, Milton Keynes, UK 4. Department of Management Systems and Sciences, University of Hull, HU6 7RX, Hull, UK
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