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Forgan, Duncan H. (28 November 2016). "The Galactic Club or Galactic Cliques? Exploring the limits of interstellar hegemony and the Zoo Hypothesis". International Journal of Astrobiology. 16 (4): 349–354. doi:10.1017/s1473550416000392. hdl:10023/10869. ISSN1473-5504. S2CID59041278.
Forgan, Duncan H. (28 November 2016). "The Galactic Club or Galactic Cliques? Exploring the limits of interstellar hegemony and the Zoo Hypothesis". International Journal of Astrobiology. 16 (4): 349–354. doi:10.1017/s1473550416000392. hdl:10023/10869. ISSN1473-5504. S2CID59041278.
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Forgan, Duncan H. (28 November 2016). "The Galactic Club or Galactic Cliques? Exploring the limits of interstellar hegemony and the Zoo Hypothesis". International Journal of Astrobiology. 16 (4): 349–354. doi:10.1017/s1473550416000392. hdl:10023/10869. ISSN1473-5504. S2CID59041278.