Loris Penserini Lin Liu John Mylopoulos Maurizio Panti Luca Spalazzi Cooperation strategies for agent-based P2P systems. 3-21 2003 1 Web Intelligence and Agent Systems 1 http://iospress.metapress.com/openurl.asp?genre=article&issn=1570-1263&volume=1&issue=1&spage=3 db/journals/wias/wias1.html#PenseriniLMPS03