TY - CPAPER KW - Invited AU - Lucia Reining BT - Workshop 40 years of the GW approximation for the Electronic Self-Energy: Achievements and Challenges , Bad Honnef (Germany) DA - 09 PY - 2005 T2 - Workshop 40 years of the GW approximation for the Electronic Self-Energy: Achievements and Challenges , Bad Honnef (Germany) TI - Theoretical spectroscopy: some developments and applications based on GW ER -