webpage http://www.scopus.com/inward/record.url?eid=2-s2.0-84906861983&partnerID=MN8TOARS http://dx.doi.org/10.1145/2556195.2556198
published in Proceedings of the 7th ACM international conference on Web search and data mining Journal WSDM 2014 - Proceedings of the 7th ACM International Conference on Web Search and Data Mining Proceedings