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2. Rescher, N.: A Useful Inheritance. Evolutionary Aspects of the Theory of Knowledge. University Press of America, Lanham (1990), Chap. 6
3. Abbott, E.A., Stewart, I.: The Annotated Flatland. Perseus, Cambridge (2001)
4. Stewart, I.: Flatterland: Like Flatland, Only More So. Macmillan, New York (2001) (in German: Flacherland. München: Beck 2003; Reinbek: Rowohlt 2004)
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