5G infrastructures supporting end-user and operational services: The 5G-XHaul architectural perspective - Tzanakaki, A.; Anastasopoulos, M.; Simeonidou, D.; Berberana, I.; Syrivelis, D.; Korakis, T.; Flegkas, P.; Mur, D.C.; Demirkol, I.; Gutiérrez, J.; Grass, E.; Qing, W.; et al. (2016)