The most luminous blue quasars at 3.0 < z < 3.3. I. A tale of two X-ray populationsDOI: info:10.1051/0004-6361/201936911v. 632A109
Nardini, E., Lusso, E., Risaliti, G., Bisogni, S., Civano, Francesca, Elvis, Martin, Fabbiano, Giuseppina, Gilli, R., Marconi, A., Salvestrini, F., and Vignali, C. 2019. "The most luminous blue quasars at 3.0 < z < 3.3. I. A tale of two X-ray populations." Astronomy and Astrophysics, 632 A109. https://doi.org/10.1051/0004-6361/201936911.