<XML><RECORDS><RECORD><REFERENCE_TYPE>10</REFERENCE_TYPE><REFNUM>9320</REFNUM><AUTHORS><AUTHOR>Calder,M.</AUTHOR><AUTHOR>Sevegnani,M.</AUTHOR></AUTHORS><YEAR>2010</YEAR><TITLE>Bigraphs with sharing</TITLE><PLACE_PUBLISHED>DCS Technical Report Series</PLACE_PUBLISHED><PUBLISHER>Dept of Computing Science, University of Glasgow</PUBLISHER><ISBN>TR-2010-310</ISBN><LABEL>Calder:2010:9320</LABEL><KEYWORDS><KEYWORD>bigraphs</KEYWORD></KEYWORDS<ABSTRACT>We extend Milner's bigraphs to bigraphs with sharing, which model system topology by a directed graph structure. We give a categorical characterisation of bigraphs with sharing and a complete axiomatisation for algebraic expression of bigraphs with sharing.</ABSTRACT><URL>xxx</URL></RECORD></RECORDS></XML>