Stephan Bloehdorn Philipp Cimiano Alistair Duke Peter Haase Jörg Heizmann Ian Thurlow Johanna Völker Ontology-Based Question Answering for Digital Libraries. 14-25 2007 conf/ercimdl/2007 ECDL http://dx.doi.org/10.1007/978-3-540-74851-9_2 db/conf/ercimdl/ecdl2007.html#BloehdornCDHHTV07