William Tuthill Parry. A new symbolism for the propositional calculus. The journal of symbolic logic, vol. 19 (1954), pp. 161–168. See errata, William Tuthill Parry. A new symbolism for the propositional calculus. The journal of symbolic logic, vol. 19 (1954), p. vi. - Gerald B. Standley. Ideographic computation in the propositional calculus. The journal of symbolic logic, vol. 19 (1954), pp. 169–171.
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