Nature,

411, 907-908 (2001). • Rapoport, A. Mathematical models of social interaction. In Luce, R. D., Bush, R. R., and Galanter, E. (eds.),

Handbook of Mathematical

Vol. 2 (Wiley, New York, 1963), pp. 493-579. ⋆⋆ Redner, S. How popular is your paper? An empirical study of the citation distribution.

Europhysics Journal B,

4, 131-134 (1998). (4) إعادة تقديم بنية المجموعات

The paper Harrison presented that triggered our work on affiliation networks is: ⋆ White, H. C. What is the center of the small world? (paper presented at American Association for the Advancement of Science annual symposium, Washington, D.C., February 17-22, 2000).

And two classic references dealing with the importance of groups to the structure of social networks are: ⋆⋆ Nadel, F. S.

Theory of Social Structure (Free Press, Glencoe, IL, 1957). ⋆⋆ Breiger, R. L. The duality of persons and groups.

Social Forces,

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