S. Wu, J. Hofman, W. Mason, и D. Watts. Proceedings of the 20th International Conference on World Wide Web, стр. 705--714. New York, NY, USA, ACM, (2011)
E. Bakshy, J. Hofman, W. Mason, и D. Watts. Proceedings of the Fourth ACM International Conference on Web Search and Data Mining, стр. 65--74. New York, NY, USA, ACM, (2011)