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}  Articles to check out:   @article{0004-637X-781-2-105,  Author author  = {G. Lanzuisi and G. Ponti and M. Salvato and G. Hasinger and N. Cappelluti and A. Bongiorno and M. Brusa and E. Lusso and P. K. Nandra and A. Merloni and J. Silverman and J. Trump and C. Vignali and A. Comastri and R. Gilli and M. Schramm and C. Steinhardt and D. Sanders and J. Kartaltepe and D. Rosario and B. Trakhtenbrot}, Journal journal  = {The Astrophysical Journal}, Number number  = {2}, Pages pages  = {105}, Title title  = {Active {{Active  Galactic Nucleus X-Ray Variability in the XMM-COSMOS Survey},  Volume Survey}},  volume  = {781}, Year year  = {2014}} {2014},  }  @article{147701,  Author author  = {Mendez, Alexander J. and Coil, Alison L. and Aird, James and Diamond-Stanic, Aleksandar M. and Moustakas, John and Blanton, Michael R. and Cool, Richard J. and Eisenstein, Daniel J. and Kenneth C. Wong and Zhu, Guangtun}, Journal journal  = {The Astrophysical Journal}, Month month  = {June 1, 2013}, Pages pages  = {40}, Title title  = {PRIMUS: {{PRIMUS:  Infrared and X-Ray AGN Selection Techniques at 0.2 < z < 1.2},  Volume 1.2}},  volume  = {770}, Year year  = {2013}} {2013},  }  @article{Lanzuisi_2014,  doi = {10.1088/0004-637x/781/2/105},  url = {http://dx.doi.org/10.1088/0004-637X/781/2/105},  year = {2014},  month = {jan},  publisher = {{IOP} Publishing},  volume = {781},  number = {2},  pages = {105},  author = {G. Lanzuisi and G. Ponti and M. Salvato and G. Hasinger and N. Cappelluti and A. Bongiorno and M. Brusa and E. Lusso and P. K. Nandra and A. Merloni and J. Silverman and J. Trump and C. Vignali and A. Comastri and R. Gilli and M. Schramm and C. Steinhardt and D. Sanders and J. Kartaltepe and D. Rosario and B. Trakhtenbrot},  title = {{{ACTIVE} {GALACTIC} {NUCLEUS} X-{RAY} {VARIABILITY} {IN} {THE} {XMM} -{COSMOS} {SURVEY}}},  journal = {{ApJ}},  }