Jakub Piskorski Hristo Tanev Pinar Oezden Wennerberg Extracting Violent Events From On-Line News for Ontology Population. 287-300 2007 conf/bis/2007 BIS http://dx.doi.org/10.1007/978-3-540-72035-5_22 db/conf/bis/bis2007.html#PiskorskiTW07