Brinkmann, W. P. MPI for Extraterrestrial Physics, Max Planck Society; Theory and Complex Plasmas, MPI for Extraterrestrial Physics, Max Planck Society;
Gliozzi, M., Papadakis, I. E., & Brinkmann, W. P. (2007). Long-term X-ray spectral variability of the radio-loud narrow-line Seyfert 1 galaxy PKS 0558-504. Astrophysical Journal, 656(2 Part 1), 691-698. doi:10.1086/510798.