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S. Hellmann, J. Lehmann, S. Auer, and M. Nitzschke. EKAW, page 446--449. (2012)published at EKAW, preprint http://jens-lehmann.org/files/2012/ekaw_nif_combinator.pdf.
S. Hellmann, J. Lehmann, and S. Auer. EKAW 2012, Springer, (2012)published at EKAW, preprint: http://svn.aksw.org/papers/2012/NIF/EKAW_short_paper/public.pdf.
S. Auer, and J. Lehmann. Proceedings of the ESWC (2007), volume 4519 of Lecture Notes in Computer Science, page 503--517. Berlin / Heidelberg, Springer, (2007)
G. Kobilarov, C. Bizer, S. Auer, and J. Lehmann. Proceedings of Developers Track of 18th International World Wide Web Conference (WWW 2009), April 20th-24th, Madrid, Spain, (April 2009)
S. Hellmann, J. Lehmann, and S. Auer. Proceedings of the Poster and Demonstration Session at the 7th International Semantic Web Conference (ISWC2008), Karlsruhe, Germany, October 28, 2008, volume 401 of CEUR Workshop Proceedings, CEUR-WS.org, (2008)
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)