S. Hellmann, J. Lehmann, and S. Auer. Learning of OWL Class Expressions on Very Large Knowledge Bases and its Applications, chapter 5, IGI Global, (2011)
A. Klebeck, S. Hellmann, C. Ehrlich, and S. Auer. The Semanic Web: Research and Applications, volume 6644 of Lecture Notes in Computer Science, Springer Berlin / Heidelberg, (2011)
B. Klimek, J. McCrae, C. Lehmann, and S. Hellmann. Proceedings of Language, Data, and Knowledge - First International Conference, LDK 2017, volume 10318 of Lecture Notes in Computer Science, page 42--57. Springer Verlag, (2017)
B. Klimek, M. Ackermann, A. Kirschenbaum, and S. Hellmann. Proceedings of the International Conference of the German Society for Computational Linguistics and Language Technology, German Society for Computational Linguistics and Language Technology, (2017)
M. Röder, R. Usbeck, S. Hellmann, D. Gerber, and A. Both. Proceedings of the Ninth International Conference on Language Resources and Evaluation (LREC'14), page 3529--3533. Reykjavik, Iceland, European Language Resources Association (ELRA), (May 2014)
C. Chiarcos, S. Nordhoff, and S. Hellmann (Eds.) Springer, Heidelberg, (2012)companion volume of the Workshop on Linked Data in Linguistics 2012 (LDL-2012), held in conjunction with the 34th Annual Meeting of the German Linguistic Society (DGfS), March 2012, Frankfurt/M., Germany.
S. Hellmann, A. Filipowska, C. Barriere, P. Mendes, and D. Kontokostas. Proceedings of 1st International Workshop on NLP and DBpedia, October 21-25, Sydney, Australia, volume 1064 of NLP & DBpedia 2013, Sydney, Australia, CEUR Workshop Proceedings, (October 2013)