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On axiom systems of propositional calculi, V
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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 Banach theorem on contraction mappings
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On mutant sets in semigroups
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On some measure-theoretic results in curve geometry.
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On a variant of Hausdorff measure-bend
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The area of discontinuous surfaces
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Further properties of reduced measure-bend
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