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This paper was written while the latter author was on contract with theOrganization of American States, as a Visiting Professor in theUniversidad Nacional del Sur, Bahía Blanca, Argentina.
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Brignole, D., da Costa, N.C.A. On supernormal Ehresmann-Dedecker universes. Math Z 122, 342–350 (1971). https://doi.org/10.1007/BF01110169
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DOI: https://doi.org/10.1007/BF01110169