David Ahn Sisay Fissaha Adafre Maarten de Rijke Towards Task-Based Temporal Extraction and Recognition. 2005 conf/dagstuhl/2005P5151 Annotating, Extracting and Reasoning about Time and Events http://drops.dagstuhl.de/opus/volltexte/2005/315 db/conf/dagstuhl/P5151.html#AhnAR05