Hartrumpf, Sven; Ingo Glöckner und Johannes Leveling (2008b). University of Hagen at QA@CLEF 2008: Efficient question answering with question decomposition and multiple answer streams. In Results of the CLEF 2008 Cross-Language System Evaluation Campaign, Working Notes for the CLEF 2008 Workshop. Aarhus, Denmark. http://www.clef-campaign.org/2008/working_notes/hartrumpf-paperCLEF2008.pdf.
Hartrumpf, Sven; Ingo Glöckner und Johannes Leveling (2008a). Coreference resolution for questions and answer merging by validation. In Advances in Multilingual and Multimodal Information Retrieval: 8th Workshop of the Cross-Language Evaluation Forum, CLEF 2007 (herausgegeben von Peters, Carol; Valentin Jijkoun; Thomas Mandl; Henning Müller; Douglas W. Oard; Anselmo Peñas; Vivien Petras und Diana Santos), Band 5152 von Lecture Notes in Computer Science (LNCS), S. 269-272. Berlin: Springer.
Leveling, Johannes (2008). Improving response time for question answering. In Proceedings of the LWA 2008. Würzburg, Germany: Gesellschaft für Informatik.
Leveling, Johannes (2007a). IRSAW - towards semantic annotation of documents for question answering. In CNI Spring 2007 Task Force Meeting. Phoenix, Arizona: CNI. http://www.cni.org/tfms/2007a.spring/abstracts/PB-irsaw-leveling.html.
Hartrumpf, Sven; Ingo Glöckner und Johannes Leveling (2007). University of Hagen at QA@CLEF 2007: Coreference resolution for questions and answer merging. In Results of the CLEF 2007 Cross-Language System Evaluation Campaign, Working Notes for the CLEF 2007 Workshop. Budapest, Hungary. http://www.clef-campaign.org/2007/working_notes/hartrumpfCLEF2007.pdf.
Leveling, Johannes (2007b). A modified information retrieval approach to produce answer candidates for question answering. In Proceedings of the LWA 2007 (Lernen-Wissen-Adaption), Workshop FGIR (herausgegeben von Hinneburg, Alexander). Halle/Saale, Germany: Gesellschaft für Informatik.
Leveling, Johannes und Sven Hartrumpf (2007). University of Hagen at GeoCLEF 2007: Exploring location indicators for geographic information retrieval. In Results of the CLEF 2007 Cross-Language System Evaluation Campaign, Working Notes for the CLEF 2007 Workshop. Budapest, Hungary. http://www.clef-campaign.org/2007/working_notes/levelingCLEF2007.pdf.
Hartrumpf, Sven und Johannes Leveling (2006). University of Hagen at QA@CLEF 2006: Interpretation and normalization of temporal expressions. In Results of the CLEF 2006 Cross-Language System Evaluation Campaign, Working Notes for the CLEF 2006 Workshop (herausgegeben von Nardi, Alessandro; Carol Peters und José Luis Vicedo). Alicante, Spain. http://www.clef-campaign.org/2006/working_notes/workingnotes2006/hartrumpfCLEF2006.pdf.
Leveling, Johannes (2006). On the role of information retrieval in the question answering system IRSAW. In Proceedings of the LWA 2006 (Learning, Knowledge, and Adaptability), Workshop Information Retrieval, S. 119-125. Hildesheim, Germany: Universität Hildesheim. http://web1.bib.uni-hildesheim.de/2006/fgir2006/Leveling.pdf.
Leveling, Johannes und Sven Hartrumpf (2006). On metonymy recognition for GIR. In Proceedings of GIR-2006, the 3rd Workshop on Geographical Information Retrieval (hosted by SIGIR 2006). Seattle, Washington. http://www.geo.unizh.ch/~rsp/gir06/papers/individual/leveling.pdf.
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