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This is an expanded version of a paper to appear in the proceedings of the International Congress of Science and Technology—45 years of the National Research Council of Brazil.
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Smale, S. Finding a horseshoe on the beaches of Rio. The Mathematical Intelligencer 20, 39–44 (1998). https://doi.org/10.1007/BF03024399
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DOI: https://doi.org/10.1007/BF03024399