Xuejun Yang Huadong Dai Yuhua Tang Xiaodong Yi A General Metric of Load Balancing in delta-Range. 311-321 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2834&spage=311 2003 conf/appt/2003 APPT db/conf/appt/appt2003.html#YangDTY03