Dan Liu Xinsong Liu Zhijie Qiu Gongjun Yan A High Efficiency Distributed Mutual Exclusion Algorithm. 75-84 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2834&spage=75 2003 conf/appt/2003 APPT db/conf/appt/appt2003.html#LiuLQY03