TY - CPAPER KW - Invited AU - Francesco Sottile BT - 11th Journées de la Matière Condensée, Strasbourg, France DA - 08/27 PY - 2008 T2 - 11th Journées de la Matière Condensée, Strasbourg, France TI - Ab Initio calculations of electronic excitations: Carbon Nanotubes and Graphene layer systems ER -