Claudio Gutierrez Carlos A. Hurtado Alejandro A. Vaisman The Meaning of Erasing in RDF under the Katsuno-Mendelzon Approach. 2006 conf/webdb/2006 WebDB http://db.ucsd.edu/webdb2006/camera-ready/paginated/07-137.pdf db/conf/webdb/webdb2006.html#GutierrezHV06