A photometric redshift of z = 6.39 +/- 0.12 for GRB 050904. - Haislip JB; Nysewander MC; Reichart DE; Levan A; Tanvir N; Cenko SB; Fox DB; Price PA; Castro-Tirado AJ; Gorosabel J; Evans CR; Figueredo E; et al. (Nature, 2006)