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Allatum est die 6 Aprilis 1970
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Przełęcki, M., Wójcicki, R. Inessential parts of extensions of first-order theories. Stud Logica 28, 83–95 (1971). https://doi.org/10.1007/BF02124268
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DOI: https://doi.org/10.1007/BF02124268