Robert Danek Vassos Hadzilacos Local-Spin Group Mutual Exclusion Algorithms. 71-85 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3274&spage=71 2004 conf/wdag/2004 DISC db/conf/wdag/disc2004.html#DanekH04