Shankar, F., Weinberg, D. H., Marsden, C., Grylls, P. J., Bernardi, M., Yang, G., Moster, B., Fu, H., Carraro, R., Alexander, D. M., Allevato, V., Ananna, T. T., Bongiorno, A., Calderone, G., Civano, F., Daddi, E., Delvecchio, I., Duras, F., La Franca, F., Lapi, A., Lu, Y., Menci, N., Mezcua, M., Ricci, F., Rodighiero, G., Sheth, R. K., Suh, H., Villforth, C., & Zanisi, L. (2020). probing black hole accretion tracks, scaling relations, and radiative efficiencies from stacked X-ray active galactic nuclei. Monthly notices of the Royal Astronomical Society, 493(1), 1500–1511. http://access.bl.uk/ark:/81055/vdc_100101912111.0x000040