Li, L., Alderson, D., Doyle, J.C. and Willinger, W.. "Towards a theory of scale-free graphs: Definition, properties, and implications." Internet Mathematics 2 , no. 4 (2005): 431--523.

Wu, Andrew Y., Garland, Michael and Han, Jiawei. "Mining scale-free networks using geodesic clustering." Paper presented at the meeting of the KDD '04: Proceedings of the tenth ACM SIGKDD international conference on Knowledge discovery and data mining, New York, NY, USA, 2004.