D. Jurafsky, and J. Martin. Prentice Hall series in artificial intelligence Prentice Hall, Pearson Education International, London u.a., 2. ed., Pearson International Edition edition, (2009)
J. Brase, and J. Klump. WissKom 2007: Wissenschaftskommunikation der Zukunft: 4. Konferenz der Zentralbibliothek, Forschungszentrum Jülich, 6. - 8. November 2007, page 159-167. (2007)
A. Lee, R. Prasad, A. Joshi, and N. Dinesh. Prague, Czech Republic, Proceedings of the 5th International Workshop on Treebanks and Linguistic Theories., (Dezember 2006)