Hamed Ahmadi Mahmoud Reza Hashemi Shervin Shirmohammadi 606-610 2015 CloudCom https://doi.org/10.1109/CloudCom.2015.53 https://doi.ieeecomputersociety.org/10.1109/CloudCom.2015.53 conf/cloudcom/2015 db/conf/cloudcom/cloudcom2015.html#AhmadiHS15