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  1. G. H. von Wright. Interpretations of modal logic. Mind, n.s. vol. 61 , pp. 165–177.Alan Ross Anderson - 1953 - Journal of Symbolic Logic 18 (2):176-177.
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  • (1 other version)An Essay in Modal Logic.Georg H. von Wright - 1953 - Philosophy 28 (104):76-79.
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