Perola G.C.; Puccetti S.; Fiore F.; Sacchi N.; Brusa M.; Cocchia F.; Baldi A.; Carangelo N.; Ciliegi P.; Comastri A.; La Franca F.; Maiolino R.; Matt G.; Mignoli M.; Molendi S.; Vignali C., The HELLAS2XMM Survey. VI. X-ray absorption in the 1df AGN sample through a
spectral analysis, «ASTRONOMY & ASTROPHYSICS», 2004, 421, pp. 491 - 501 [Scientific article]
Vignali C.; Brandt W.N.; Schneider D.P., The z>4 quasar population observed by Chandra and XMM-Newton, in: Multiwavelength AGN Surveys, SINGAPORE, World Scientific, 2004, pp. 287 - 290 (atti di: Multiwavelength AGN Surveys, Cozumel, 8-12 dicembre 2003) [Contribution to conference proceedings]
Vignali C.; Comastri A.; Alexander D.M., Type II quasar candidates in the Sloan Digital Sky Survey: evidence for
X-ray obscuration, in: AGN6. La natura composita dei Nuclei Galattici Attivi, FIRENZE, s.n, 2004(atti di: 6th Italian National Meeting on AGN, Volterra, 25-28 maggio 2004) [Contribution to conference proceedings]
Bauer F.E.; Vignali C.; Alexander D.M.; Brandt W.N.; Garmire G.P.; Hornschemeier A.E.; Broos P.S.; Townsley L.K.; Schneider D.P., X-ray spectroscopy and variability of the AGN source population detected
in the 2 Ms Chandra Deep Field-North Survey, «ADVANCES IN SPACE RESEARCH», 2004, 34, pp. 2555 - 2560 [Scientific article]
Brandt W.N.; Schneider D.P.; Vignali C., X-raying Active Galaxies Found and Missed by the Sloan Digital Sky Survey, in: AGN Physics with the Sloan Digital Sky Survey, SAN FRANCISCO, ASP Conferences Series, 2004, 311, pp. 303 - 312 (atti di: AGN Physics with the Sloan Digital Sky Survey, Priceton, 27-31 luglio 2003) [Contribution to conference proceedings]
Vignali C.; Brandt W.N.; Schneider D.P., X-rays from the Dawn of the Modern Universe. Chandra and XMM-Newton
Observations of z>4 Quasars, in: AGN Physics with the Sloan Digital Sky Survey, SAN FRANCISCO, ASP Conferences Series, 2004, 311, pp. 317 - 320 (atti di: AGN Physics with the Sloan Digital Sky Survey, Princeton, 27-31 luglio 2003) [Contribution to conference proceedings]
Brandt W.N.; Vignali C.; Schneider D.P.; Alexander D.M.; Anderson S.F.; Bauer F.E.; Fan X.; Garmire G.P.; Kaspi S.; Richards G.T., X-rays from the first massive black holes, «ADVANCES IN SPACE RESEARCH», 2004, 34, pp. 2478 - 2485 [Scientific article]
