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;
Brynildsen, N., Maltby, P., Kjeldseth-Moe, O., & Wilhelm, K. (2003). Oscillations in the wings of sunspot transition region lines. Astronomy and Astrophysics, 398, L15-L18.