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[5] Kii, S., "IE Managers Discuss Strategic Approaches to Technological and Competitive Challenges", Industrial Engineering, 7th Annual IE Manager's Seminar, May, 1985, pp. 98-102.

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[9] Wemmerlov, U., "Economic Justification of Group Technology Software: Documentation and Analysis of Current Practices", Journal of Operations Management, Vol. 9 No. 4, pp 500-525.

[10] KMPG White Paper and Evaluation of The Purchasing Extranet, 1997.