Olivia Breysse Michel De Glas A New Approach to the Concepts of Boundary and Contact: Toward an Alternative to Mereotopology. 217-238 2007 78 Fundam. Inform. 2 http://iospress.metapress.com/openurl.asp?genre=article&issn=0169-2968&volume=78&issue=2&spage=217 db/journals/fuin/fuin78.html#BreysseG07