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Celesti, A., F. Tusa, M. Villari, and A. Puliafito,  "An Approach To Enable Cloud Service Providers To Arrange Iaas, Paas, And Saas Using External Virtualization Infrastructures",  \i Services (SERVICES), 2011 IEEE World Congress on\i0 , Los Alamitos, CA, IEEE Computer Society, pp. 607?611, 9, 2011.\par \par }