Pietsch, W., Roberts, T., Sako, M., Freyberg, M., Read, A., Borozdin, K., …Ward, M. (2001). XMM-Newton observations of NGC 253: Resolving the emission components in the disk and nuclear area. Astronomy & Astrophysics, 365(1), L174-L180. https://doi.org/10.1051/0004-6361%3A20000068