Karl Menger. Tri-operational algebra. Reports of a mathematical colloquium, issue 5-6 (1944), pp. 3–10. - Ferdinand L. Brown. Remarks concerning tri-operational algebra. Reports of a mathematical colloquium, issue 5-6 (1944), pp. 11–15. - Carl G. Hempel. Studies in the logic of confirmation. Mind, n.s. vol. 54 (1945), pp. 1–26, 97-121. | The Journal of Symbolic Logic

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Karl Menger. Tri-operational algebra. Reports of a mathematical colloquium, issue 5-6 (1944), pp. 3–10. - Ferdinand L. Brown. Remarks concerning tri-operational algebra. Reports of a mathematical colloquium, issue 5-6 (1944), pp. 11–15. - Carl G. Hempel. Studies in the logic of confirmation. Mind, n.s. vol. 54 (1945), pp. 1–26, 97-121.

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Karl Menger. Tri-operational algebra. Reports of a mathematical colloquium, issue 5-6 (1944), pp. 3–10. - Ferdinand L. Brown. Remarks concerning tri-operational algebra. Reports of a mathematical colloquium, issue 5-6 (1944), pp. 11–15. - Carl G. Hempel. Studies in the logic of confirmation. Mind, n.s. vol. 54 (1945), pp. 1–26, 97-121.

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Karl Menger. Tri-operational algebra. Reports of a mathematical colloquium, issue 5-6 (1944), pp. 3–10. - Ferdinand L. Brown. Remarks concerning tri-operational algebra. Reports of a mathematical colloquium, issue 5-6 (1944), pp. 11–15. - Carl G. Hempel. Studies in the logic of confirmation. Mind, n.s. vol. 54 (1945), pp. 1–26, 97-121.

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