Charles University at CLEF 2007 Ad-Hoc Track. In: Advances in Multilingual and Multimodal Information Retrieval, 8th Workshop of the Cross-Language Evaluation Forum, CLEF 2007, Budapest, Hungary, September 19-21, 2007, Revised Selected Papers, Lecture Notes in Computer Science, ISSN 0302-9743, vol. 5152/2008, no. 5152, pp. 33-36, Springer, Berlin / Heidelberg, ISBN 978-3-540-85759-4 (bibtex)