Ivo Düntsch Beata Konikowska A Multi-modal Logic for Disagreement and Exhaustiveness. 215-238 2007 75 Fundam. Inform. 1-4 http://iospress.metapress.com/openurl.asp?genre=article&issn=0169-2968&volume=75&issue=4&spage=215 db/journals/fuin/fuin75.html#DuntschK07