Bell, M. E., Tzioumis, T., Uttley, P., Fender, R. P., Arévalo, P., Breedt, E., McHardy, I., Calvelo, D. E., Jamil, O., & Körding, E. (2011). X-ray and radio variability in the low-luminosity active galactic nucleus NGC 7213. Monthly Notices of the Royal Astronomical Society, 411(1), 402-410. doi:10.1111/j.1365-2966.2010.17692.x.