Tzanakaki A, Anastasopoulos M, Georgakilas K, Landi G, Bernini G, Ciulli N, Riera J, Escalona E, Garcia-espin J, Hesselbach X, et al. Planning of dynamic virtual optical cloud infrastructures: The GEYSERS approach. IEEE Communications MagazineIEEE Communications Magazine [Internet]. 2014;52(1):26-34.