Curdt, W. Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society; MPI for Aeronomy, Max Planck Institute for Solar System Research, Max Planck Society;
Kariyappa, R., Varghese, B. A., & Curdt, W. (2001). Temporal and spatial variations of the quiet upper chromosphere from SOHO/SUMER observations of hydrogen Lyman lines. Astronomy and Astrophysics, 374, 691-696.