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title = {{Optical Selection of Faint Active Galactic Nuclei in the {COSMOS} Field}},  journal = {The Astrophysical Journal Supplement Series},  }  @article{Lusso_2010,  doi = {10.1051/0004-6361/200913298},  url = {http://dx.doi.org/10.1051/0004-6361/200913298},  year = {2010},  month = {mar},  publisher = {{EDP} Sciences},  volume = {512},  pages = {A34},  author = {E. Lusso and A. Comastri and C. Vignali and G. Zamorani and M. Brusa and R. Gilli and K. Iwasawa and M. Salvato and F. Civano and M. Elvis and A. Merloni and A. Bongiorno and J. R. Trump and A. M. Koekemoer and E. Schinnerer and E. Le Floc{\textquotesingle}h and N. Cappelluti and K. Jahnke and M. Sargent and J. Silverman and V. Mainieri and F. Fiore and M. Bolzonella and O. Le F{\`{e}}vre and B. Garilli and A. Iovino and J. P. Kneib and F. Lamareille and S. Lilly and M. Mignoli and M. Scodeggio and D. Vergani},  title = {{The X-ray to optical-{UV} luminosity ratio of X-ray selected type 1 {AGN} in {XMM}-{COSMOS}}},  journal = {Astronomy and Astrophysics},  }