P. Singer, D. Helic, A. Hotho, and M. Strohmaier. Proceedings of the 24th International Conference on World Wide Web, page 1003--1013. International World Wide Web Conferences Steering Committee, (2015)
W. Cohen, and J. Richman. Proceedings of the eighth ACM SIGKDD international conference on Knowledge discovery and data mining, page 475--480. ACM, (2002)