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\section{References and articles to read}  PDF of Chandra COSMOS Survey -- http://cxc.cfa.harvard.edu/ChandraDecade/PDFs/Elvis_3.pdf  COSMOS public data & archives -- http://cosmos.astro.caltech.edu/page/datasets ;  http://irsa.ipac.caltech.edu/data/COSMOS/datasets.html  \subsection{X-ray Papers}  \cite{Lanzuisi_2014}  \cite{Lusso_2010}