D. Nguyen, and J. Leveling. Natural Language Processing and Information Systems - 18th International Conference on Applications of Natural Language to Information Systems, NLDB 2013, Salford, UK, June 2013, Proceedings, volume 7934 of Lecture Notes in Computer Science (LNCS), page 90--101. Springer, (2013)
T. Beckers, S. Dungs, N. Fuhr, M. Jordan, and S. Kriewel. Proceedings of the SIGIR 2012 Workshop on Open Source Information Retrieval, page 9-16. Dunedin, New Zealand, Department of Computer Science, University of Otago, (August 2012)