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Treister, Ezequiel ,  Castander, Francisco J. ,  Maccarone, Thomas J. ,  Gawiser, Eric ,  Coppi, Paolo S. ,  Urry, C. Megan ,  Maza Sancho, José ,  Herrera, David ,  González, Valentino ,  Montoya, Carlos ,  Pineda Bravo, Pedro ,  [The Calan-Yale Deep Extragalactic Research (CYDER) survey: Optical properties and deep spectroscopy of serendipitous X-ray sources]

Treister, Ezequiel ,  Castander, Francisco J. ,  Maccarone, Thomas J. ,  Herrera, David ,  Gawiser, Eric ,  Maza Sancho, José ,  Coppi, Paolo S. ,  [An X-ray-selected active galactic nucleus at z=4.6 discovered by the CYDER survey]