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., Leifsen, T., Kjeldseth-Moe, O., & Wilhelm, K. (2000). Observations of sunspot transition region oscillations. Solar Physics, 191, 129-159.