C. Kohlschütter, P. Fankhauser, und W. Nejdl. Proc. of 3rd ACM International Conference on Web Search and Data Mining New York City, NY USA (WSDM 2010)., (2010)
T. Tran, N. Tran, A. Teka Hadgu, und R. Jäschke. Proceedings of the 2015 Conference on Empirical Methods in Natural Language Processing (EMNLP), Association for Computational Linguistics, (September 2015)