1. Bouma, G., Fahmi, I., Mur, J., van Noord, G., van der Plas, L., Tiedeman, J.: Linguistic knowledge and question answering. Traitement Automatique des Langues 2(46), 15–39 (2005)
2. Bouma, G., van Noord, G., Malouf, R.: Alpino: Wide-coverage computational analysis of Dutch. In: Computational Linguistics in The Netherlands 2000, Rodopi, Amsterdam (2001)
3. Lecture Notes in Artificial Intelligence;J. Tiedemann,2005
4. Rubens, N.: Lucqe - lucene query expansion (2007), http://lucene-qe.sourceforge.net/
5. Rubens, N.: The application of fuzzy logic to the construction of the ranking function of information retrieval systems. Computer Modelling and New Technologies 10(1), 20–27 (2006)