Natural Language Processing and Information Systems 18th International Conference on Applications of Natural Language to Information Systems, NLDB 2013, Salford, UK, June 19-21, 2013. Proceedings - Métais, Elisabeth; Meziane, Farid; Saraee, Mohamad; Sugumaran, Vijayan; Vadera, Sunil (Springer Berlin Heidelberg : Imprint: Springer, 2013)