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October 1911A sensuous representation of paths that lead from the inside to the outside of an ordinary sphere in point space of four dimensions without penetrating the surface of the sphere
C. J. Keyser "A sensuous representation of paths that lead from the inside to the outside of an ordinary sphere in point space of four dimensions without penetrating the surface of the sphere," Bulletin of the American Mathematical Society, Bull. Amer. Math. Soc. 18(1), 18-22, (October 1911)
