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Grewell, Greg (2001). «Colonizing the Universe: Science Fictions Then, Now, and in the (Imagined) Future». Rocky Mountain Review of Language and Literature55 (2): 25-47. JSTOR1348255. S2CID171048588. doi:10.2307/1348255.
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Grewell, Greg (2001). «Colonizing the Universe: Science Fictions Then, Now, and in the (Imagined) Future». Rocky Mountain Review of Language and Literature55 (2): 25-47. JSTOR1348255. S2CID171048588. doi:10.2307/1348255.
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«extraterrestre». Wikcionario, el diccionario libre. 22 de abril de 2023. Consultado el 24 de diciembre de 2023.