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APA Citation
Menzel, M., Merloni, A., Georgakakis, A., Salvato, M., Aubourg, E., Brandt, W. N., Brusa, M., Buchner, J., Dwelly, T., Nandra, K., Pâris, I., Petitjean, P., & Schwope, A. (2016). a spectroscopic survey of X-ray-selected AGNs in the northern XMM-XXL field. Monthly notices of the Royal Astronomical Society, 457(1), 110–132. http://access.bl.uk/ark:/81055/vdc_100151517016.0x000054