I. Kloumann, and J. Kleinberg. Proceedings of the 20th ACM SIGKDD International Conference on Knowledge Discovery and Data Mining, page 1366--1375. New York, NY, USA, ACM, (2014)
B. Fonseca, P. Golgher, B. Pôssas, B. Ribeiro-Neto, and N. Ziviani. CIKM '05: Proceedings of the 14th ACM international conference on Information and knowledge management, page 696--703. New York, NY, USA, ACM Press, (2005)