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The online version of the original article can be found at: http://dx.doi.org/10.1007/s10992-005-9023-6
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Humberstone, L. Identical Twins, Deduction Theorems, and Pattern Functions: Exploring the Implicative BCSK Fragment of S5 . J Philos Logic 36, 249 (2007). https://doi.org/10.1007/s10992-007-9046-2
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DOI: https://doi.org/10.1007/s10992-007-9046-2