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A, Miler, B N. Maltz, D, Herlocker, J.L. [14]Konstar January-February: 139-145. 2000 [28] Wenger, E. Communities of practice: the key to knowledge ollaborative filtering to Usenet news, Communications of strategy. Knowledge Directions: The Journal of the Institute the ACM Volume 40, No. 3(Mar. 1997) for Knowledge Management, 1, 48-93, 1999[3] Albert, R. and Barabasi, AL. Statistical Mechanics of Complex Networks. Review of Modern Physics, 74, 47, 2002. [4] Balabanovi, M., and Shoham, Y. Fab: content-based, collaborative recommendation, Communications of the ACM Volume 40, No. 3 (Mar. 1997) [5] Becerra-Fernandez, I. Facilitating the Online Seach of Experts at NASA using Expert Seeker People-Finder. Proceedings of the 3rd International Conference on Practical Aspects of Knowledge Management (PAKM), Basel, Switzerland, 2000. [6] Bollacker, K.D., Lawrence, S., and Giles, C.L. 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