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Greber, T.; Raetzo, O.; Kreutz, T. J.; Schwaller, Patrick; Deichmann, W.; Wetli, E.; Osterwalder, J. (1997). A photoelectron spectrometer for k-space mapping above the Fermi level Review of Scientific Instruments, 68(12), pp. 4549-4554. American Institute of Physics (AIP) 10.1063/1.1148429