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Dear Markku:

About phone call networks, you can read:
W. Aiello, F. Chung and L. Lu, A random graph model for massive

graphs, Proceedings of the Thirty-Second Annual ACM Symposium on

Theory of Computing, (2000) 171-180.

There is a copy in . You can
also find an interesting  preprint about e-mail networks in


Iván Blanco
Ph. D. Student
Facultad de Comunicación
Universidad Pontificia de Salamanca
Avda. Champagnat 121, 37007 Salamanca
e-mail: [log in to unmask]

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