References
David Ellis,Geometry in abstract distance spaces, Publicationes Mathematicae (Debrecen), vol. 2 (1951), Issue 1.
David Ellis,Autometrized Boolean algebras. I, To appear in Canadian Jour. of Math.
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Presented to the American Mathematical Society; February23, 1951.
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Ellis, D. Notes on abstract distance geometry. Monatshefte für Mathematik 55, 185–187 (1951). https://doi.org/10.1007/BF01318533
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DOI: https://doi.org/10.1007/BF01318533