Virtual infrastructure planning: The GEYSERS approach. - Anna Tzanakaki; Markos P. Anastasopoulos; Konstantinos Georgakilas; J. A. Garciaespin; Jordi Ferrer Riera; Sergi Figuerola; Mattijs Ghijsen; Yuri Demchenko; Cees T. A. M. de Laat; Pascale Vicat-Blanc; Sebastien Soudan; Fabienne Anhalt; et al. (Future Network & Mobile Summit, 2012)