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;
Fredvik, T., Kjeldseth-Moe, O., Haugan, S. V. H., Brekke, P., Gurman, J. B., & Wilhelm, K. (2002). Variability and dynamic state of active region loops. Advances in Space Research, 30, 635-640.