Li, L., Alderson, D., Doyle, J. & Willinger, W. (2005). Towards a theory of scale-free graphs: Definition, properties, and implications. Internet Mathematics, 2, 431--523.

Wu, A. Y., Garland, M. & Han, J. (2004). Mining scale-free networks using geodesic clustering. KDD '04: Proceedings of the tenth ACM SIGKDD international conference on Knowledge discovery and data mining (p./pp. 719--724), New York, NY, USA: ACM Press. ISBN: 1-58113-888-1