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Algebraic formulations of propositional calculi
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Axiom systems of Aristotle traditional logic
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A simple characterization of Boolean rings
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A pentavalued logic and its algebraic theory
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On Axiom Systems of Propositional Calculi. XXI
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On mutant sets in semigroups
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Further properties of reduced measure-bend
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On the bend of continuous plane curves
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The area of discontinuous surfaces
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Further measure-theoretic results in curve geometry
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Some results in Lebesgue geometry of curves.