Brinkmann, W. MPI for Extraterrestrial Physics, Max Planck Society; Theory and Complex Plasmas, MPI for Extraterrestrial Physics, Max Planck Society;
McHardy, I. M., Arévalo, P., Uttley, P., Papadakis, I. E., Summons, D. P., Brinkmann, W., et al. (2007). Discovery of multiple Lorentzian components in the X-ray timing properties of the Narrow Line Seyfert 1 Ark 564. Monthly Notices of the Royal Astronomical Society, 382(3), 985-994. doi:10.1111/j.1365-2966.2007.12411.x.