Ulrich, V., Barth, S., Lischke, T., Joshi, S., Arion, T., Mucke, M., et al. (2011). Photoelectron–Auger electron coincidence spectroscopy of free molecules: New experiments. Dedicated to the memory of Professor Kai Siegbahn. Journal of Electron Spectroscopy and Related Phenomena, 183(1-3), 70-79. doi:10.1016/j.elspec.2010.03.001.