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The HELLAS2XMM survey - VIII. Optical identifications of the extended sample
Authors: Cocchia, F.; Fiore, F.; Vignali, C.; Mignoli, M.; Brusa, M.; Comastri, A.; Feruglio, C.; Baldi, A.; Carangelo, N.; Ciliegi, P.; D'Elia, V.; La Franca, F.; Maiolino, R.; Matt, G.; Molendi, S.; Perola, G. C.; Puccetti, S.
Date of Publication (YYYY-MM-DD): 2007-04
Title of Journal: Astronomy & Astrophysics
Volume: 466
Issue / Number: 1
Start Page: 31
End Page: 40
Document Type: Article
ID: 316799.0

The HELLAS2XMM survey - VII. The hard X-ray luminosity function of AGNs up to z = 4: more absorbed AGNs at low luminosities and high redshifts
Authors: La Franca, F.; Fiore, F.; Comastri, A.; Perola, G. C.; Sacchi, N.; Brusa, M.; Cocchia, F.; Feruglio, C.; Matt, G.; Vignali, C.; Carangelo, N.; Ciliegi, P.; Lamastra, A.; Maiolino, R.; Mignoli, M.; Molendi, S.; Puccetti, S.
Date of Publication (YYYY-MM-DD): 2005-12-20
Title of Journal: The Astrophysical Journal
Volume: 635
Issue / Number: 2 Part 1
Start Page: 864
End Page: 879
Document Type: Article
ID: 250564.0