Hedin, L. Department Quantum Many-Body Theory (Walter Metzner), Max Planck Institute for Solid State Research, Max Planck Society; Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;
Hedin, L. (1999). On correlation effects in electron spectroscopies and the GW approximation. Journal of Physics: Condensed Matter, 11, R 489-R 528.