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* {{cite book |last=Ćirković |first=Milan M. |editors=Nick Bostrom,Milan M. Ćirković|date=2008 |title=Global Catastrophic Risks |chapter=Observation selection effects and global catastrophic risks |publisher=[[Oxford University Press]]}}
* {{cite web |last=Dvorsky |first=George |authorlink=George Dvorsky |date=2007-08-04 |title=The Fermi Paradox: Back with a vengeance |publisher=[[Sentient Developments]] |url=http://www.sentientdevelopments.com/2007/08/fermi-paradox-back-with-vengeance.html}}
* {{cite book |last=Hanlon |first=Michael |date=2008 |title=Eternity: Our Next Billion Years |url=https://archive.org/details/eternityournextb0000hanl |publisher=[[Palgrave Macmillan]] |isbn=0-230-21931-4}}
[[Kategori:Paradoks Fermi]]
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