Xuhui Ao Naftaly H. Minsky Flexible Regulation of Distributed Coalitions. 39-60 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2808&spage=39 2003 conf/esorics/2003 ESORICS db/conf/esorics/esorics2003.html#AoM03