M. Kaya, G. Fidan, and I. Toroslu. Web Intelligence and Intelligent Agent Technology (WI-IAT), 2012 IEEE/WIC/ACM International Conferences on, 1, page 174-180. (December 2012)
J. Pasternack, and D. Roth. Proceedings of the 22nd international conference on World Wide Web, page 1009--1020. International World Wide Web Conferences Steering Committee, (2013)