1. Plepys, A.: The grey side of ICT. J. Environ. Impact Assess. Rev. 22(5), 509–523 (2002)
2. Zeadally, S., Khan, S.U., Chilamkurti, N.: Energy-efficient networking: past, present, and future. J. Supercomput. (2011, to appear)
3. Baliga, J., Ayre, R., Sorin, W.V., Hinton, K., Tucker, R.S.: Energy consumption in access networks. In: Proc. IEEE Optical Fiber Commun. Conf. (OFC), San Diego, USA, pp. 1–3 (2008)
4. Etoh, M., Ohya, T., Nakayama, Y.: Energy consumption issues on mobile network systems. In: Proc. IEEE Int. Symp. on App. & the Internet (SAINT), Turku, Finland, pp. 365–368 (2008)
5. Baliga, J., Ayre, R., Hinton, K., Tucker, R.S.: Energy consumption in wired and wireless access networks. IEEE Commun. Mag. 49(6), 70–77 (2011)