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Rescher Nicholas. Can there be random individuals? Analysis (Oxford), vol. 18 no. 5 (1958), pp. 114–117.Goddard L.. Mr. Rescher on random individuals. Analysis (Oxford), vol. 19 no. 1 (1958), pp. 18–20.Mackie J. L.. The rules of natural deduction. Analysis (Oxford), vol. 18 no. 2 (1958), pp. 27–35.Mackie J. L.. The symbolising of natural deduction. Analysis (Oxford), vol. 20 no. 2 (1959), pp. 25–37.Price Robert. Arbitrary individuals and natural deduction. Analysis (Oxford), vol. 22 no. 4 (1962), pp. 94–96.Rennie M. K.. A correction to Mackie's natural deduction. Logique et analyse, n.s. vol. 10 (1967), pp. 207–210.Wisdom, William A. · The Journal of Symbolic Logic · 1970