Dick, Steven J.
in: Vakoch, Douglas A., ed. Archaeology, Anthropology, and Interstellar Communication, ed. by Douglas A. Vakoch. Washington, DC: NASA, 2014. p. 49-63.
Harrison, Albert A.
in: Vakoch, Douglas A. and Harrison, Albert A. eds. Civilizations Beyond Earth: Extraterrestrial Life and Society. New York: Berghahn, 2011. p. 141-158.
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