Article
The Astrophysical Journal  (2009)

THE CHANDRA DEEP PROTOCLUSTER SURVEY: EVIDENCE FOR AN ENHANCEMENT OF AGN ACTIVITY IN THE SSA22 PROTOCLUSTER AT z = 3.09

Lehmer, B. D.; Alexander, D. M.; Geach, J. E.; Smail, Ian; Basu-Zych, A.; Bauer, F. E.; Chapman, S. C.; Matsuda, Y.; Scharf, C. A.; Volonteri, M.; Yamada, T.