Wilhelm, K. MPI for Aeronomy, Max Planck Institute for Solar System Research, Max Planck Society; Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society;
Wilhelm, K. (2003). Past and recent observations of the solar upper atmosphere at vacuum-ultraviolet wavelengths. Journal of Atmospheric and Solar-Terrestrial Physics, 65, 167-189.