Dimensioning the Future Pan-European Optical Network With Energy Efficiency Considerations - Tzanakaki, Anna; Katrinis, Kostas; Politi, Tanya; Stavdas, Alexandros; Pickavet, Mario; Van Daele, Peter; Simeonidou, Dimitra; O’Mahony, Mike J.; Aleksić, Slaviša; Wosinska, Lena; Monti, Paolo (Journal of Optical Communications and NetworkingJournal of Optical Communications and Networking, 2011)