[1] L. A. Adamic, R. M. Lukose, A. R. Puniyani, and B. Huberman, Search in power-law networks, Physical Review E, 2001, 64**: 046135.**
[2] R. Albert, and H. Jeong, and A. L. Barab´asi, Error and attack tolerance of complex networks, Nature, 2000, 406**, 378–381.**
[3] A. L. Barab´asi, R. Albert, and H. Jeong, Mean-field theory for scale-free random networks, **Physica**
A, 1999, 272**: 173–187.**
[4] P. J. Carrington, J. Scott, S. Wasserman, **Models And methods in social network analysis (Structural**
analysis in the social sciences)**, Cambridge University Press, 2005.**
[5] L. C. Freeman, Centrality in networks I. Conceptual clarification, Social Networks, 1979, 1**: 215–**
239.

[6] T. Hastie, R. Tibshirani, and J. Friedman, **The elements of statistical learning: Data mining,**
inference, and prediction (Springer series in statistics)**, Springer-Verlag, 2001.**
[7] P. S. Keila, and D. B. Skillicorn, Structure in the Enron email dataset, **Journal of Computational**
& Mathematical Organization Theory, 2006, 11**: 183–199.**
[8] P. Klerks, The network paradigm applied to criminal organizations, Connections, 2002, 24**: 53–65.** [9] V. E. Krebs, Mapping networks of terrorist cells, Connections, 2002, 24**: 43–52.**
[10] Y. Maeno, and Y. Ohsawa, Human-computer interactive annealing for discovering invisible dark events, IEEE Transactions on Industrial Electronics, 2007, 54**: 1184–1192.**
[11] Y. Maeno, Y. Ohsawa, and T. Ito, Catalyst personality for fostering communication among groups with opposing preference, Lecture Notes in Artificial Intelligence, Springer-Verlag, 2007, **4570**:
806–812.

[12] Y. Maeno, and Y. Ohsawa, Stable deterministic crystallization for discovering hidden hubs, Proceedings of the IEEE International Conference on Systems, Man & Cybernetics, Taipei**, 2006:**
1393–1398.

[13] Y. Maeno, K. Ito, K. Horie, and Y. Ohsawa, Human-interactive annealing for turning threat to opportunity in technology development, **Proceedings of the IEEE International Conference on Data** Mining, Workshops, Hong Kong**, 2006: 714–717.**
[14] Y. Maeno, and Y. Ohsawa, Node discovery problem for a social network, e-print **arxiv.org/abs/0710.**
4975, 2007.

[15] C. Morselli, C. Giguere, and K. Petit, The efficiency/security trade-off in criminal networks, **Social**
Networks, 2007, 29**, 143–153.**
[16] Y. Ohsawa, Data crystallization: chance discovery extended for dealing with unobservable events, New Mathematics and Natural Computation, 2005, 1**: 373–392.**
[17] Emergent information technologies and enabling policies for counter-terrorism **(ed. by R. L. Popp**
and J. Yen), IEEE Press, 2006.

[18] S. Singh, J. Allanach, T. Haiying, K. Pattipati, and P. Willett, Stochastic modeling of a terrorist event via the ASAM system, **Proceedings of the IEEE International Conference on Systems, Man**
& Cybernetics, Hague, 2004, 6**: 5673–5678.**
[19] D. J. Watts, and S. H. Strogatz, Collective dynamics of small-world networks, Nature, 1998, 398:
440–442.