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The authors were supported by an NSF Grant during some of the research for this paper.
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Bremner, A., Lewis, D.J. & Morton, P. Some varieties with points only in a field extension. Arch. Math 43, 344–350 (1984). https://doi.org/10.1007/BF01196658
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DOI: https://doi.org/10.1007/BF01196658