Volk, E.; Tenschert, A.; Gienger, M.; Oleksiak, A.; Siso, L.; Salom, J. "Improving energy efficiency in data centers and federated cloud environments: Comparison of coolemall and Eco2Clouds approaches and metrics" Proceedings - 2013 IEEE 3rd International Conference on Cloud and Green Computing, CGC 2013 and 2013 IEEE 3rd International Conference on Social Computing and Its Applications, SCA 2013 pp. 443 - 450. 2013 DOI: 10.1109/CGC.2013.76