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2. R. Descartes,Correspondence, A. Adam and P. Tannery, eds. (Vrin, Paris, 1971–1974), letter 525.
3. E. P. Wigner,Symmetries and Reflections (MIT Press, Cambridge, Massachusetts, 1967), pp. 181–184.
4. J. C. Eccles,Proc. R. Soc. London 22, 411 (1986).
5. R. Descartes, Ref. 2, letter 302.