Baoyan Song Ge Yu Dan Wang Derong Shen Guoren Wang An Efficient User Task Handling Mechanism Based on Dynamic Load-Balance for Workflow Systems. 483-494 2003 conf/apweb/2003 APWeb http://link.springer.de/link/service/series/0558/bibs/2642/26420483.htm db/conf/apweb/apweb2003.html#SongYWSW03