Pankaj Goyal Rao Mikkilineni Policy-Based Event-Driven Services-Oriented Architecture for Cloud Services Operation & Management. 135-138 2009 IEEE CLOUD https://doi.org/10.1109/CLOUD.2009.76 https://doi.ieeecomputersociety.org/10.1109/CLOUD.2009.76 conf/IEEEcloud/2009 db/conf/IEEEcloud/IEEEcloud2009.html#GoyalM09