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I would like to thank R. Magari and C. Smorynski who, directly or indirectly, encouraged me to publish this note.
Allatum est die 4 Julii 1977
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Sambin, G. Fixed points through the finite model property. Stud Logica 37, 287–289 (1978). https://doi.org/10.1007/BF02124729
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DOI: https://doi.org/10.1007/BF02124729