Bo Cheng Jie Guo Junliang Chen Xiangtao Lin A Preliminary Practice for BPEL Based Multimedia Conference Web Services Orchestration. 321-326 2008 AICT http://doi.ieeecomputersociety.org/10.1109/AICT.2008.81 conf/aict/2008 db/conf/aict/aict2008.html#ChengGCL08