Bettencourt, L. M. A., Kaiser, D. I., Kaur, J., & Physics, M. I. o. T. D. o. (2009). Scientific discovery and topological transitions in collaboration networks. Elsevier.

Bettencourt, Luis M. A., David I. Kaiser, Jasleen Kaur, and Massachusetts Institute of Technology. Department of Physics. Scientific Discovery and Topological Transitions in Collaboration Networks. Elsevier, 2009.

Bettencourt, Luis M. A., et al. Scientific Discovery and Topological Transitions in Collaboration Networks. Elsevier, 2009.