Nico Schlaefer, Jeongwoo Ko, Justin Betteridge, Guido Sautter, Manas Pathak, Eric Nyberg: Semantic Extensions of the Ephyra QA System for TREC 2007. In Proceedings of the Sixteenth Text REtrieval Conference (TREC), 2007.
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Nico Schlaefer, Petra Gieselmann, Guido Sautter: The Ephyra QA System at TREC 2006. In Proceedings of the Fifteenth Text REtrieval Conference (TREC), 2006.
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Nico Schlaefer, Petra Gieselmann, Thomas Schaaf, Alex Waibel: A Pattern Learning Approach to Question Answering within the Ephyra Framework. In Proceedings of the Ninth International Conference on TEXT, SPEECH and DIALOGUE (TSD), 2006.
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Nico Schlaefer: Deploying Semantic Resources for Open Domain Question Answering. Diploma Thesis, 2007.
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Published as:
Nico Schlaefer: A Semantic Approach to Question Answering. VDM Verlag Dr. Mueller, ISBN 3836450739, 2007.
(amazon)

Nico Schlaefer: Pattern Learning and Knowledge Annotation for Question Answering. Student Research Project, 2005.
(pdf)