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., Fredvik, T., Kjeldseth-Moe, O., & Wilhelm, K. (2001). Sunspot plumes and flow channels. Solar Physics, 198, 89-131.