Dennerl, K. High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society;
DiLella, L. High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society;
Zioutas, K., Dennerl, K., DiLella, L., Hoffmann, D. H. H., Jacoby, J., & Papaevangelou, T. (2004). Quiet-sun X-rays as signature for new particles. The Astrophysical Journal, 607, 575-579.