Kuo Zhang Xin Zhang Wei Sun Haiqi Liang Ying Huang Liangzhao Zeng Xuanzhe Liu A Policy-Driven Approach for Software-as-Services Customization. 123-130 2007 conf/wecwis/2007 CEC/EEE http://doi.ieeecomputersociety.org/10.1109/CEC-EEE.2007.9 db/conf/wecwis/cec2007.html#ZhangZSLHZL07