Tzanakaki A, Anastasopoulos M, Georgakilas K, Buysse J, De Leenheer M, Develder C, Peng S, Nejabati R, Escalona E, Simeonidou D, et al. Energy Efficiency in integrated IT and optical network infrastructures: The GEYSERS approach. In: 2011 IEEE Conference on Computer Communications Workshops, INFOCOM WKSHPS 2011. ; 2011. pp. 343-348.