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In CHI '96: Proceedings of the SIGCHI conference on Human factors in computing systems (1996), pp. 19-26.
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The American Journal of Sociology, Vol. 78, No. 6. (1973), pp. 1360-1380.
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In CSCW '04: Proceedings of the 2004 ACM conference on Computer supported cooperative work (2004), pp. 222-231.
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