Article ISI
Monthly Notices of the Royal Astronomical Society  (2013)

The high-redshift (z > 3) active galactic nucleus population in the 4-Ms Chandra Deep Field-South

Vito, F.; Vignali, C.; Gilli, R.; Comastri, A.; Iwasawa, K.; Brandt, W. N.; Alexander, D. M.; Brusa, M.; Lehmer, B.; Bauer, F. E.; Schneider, D. P.; Xue, Y. Q.; Luo, B.