A. N. Prior. Existence in Leśniewski and in Russell. Formal systems and recursive functions, Proceedings of the Eighth Logic Colloquium, Oxford, July 1963, edited by J. N. Crossley and M. A. E. Dummett, Studies in logic and the foundations of mathematics, North-Holland Publishing Company, Amsterdam1965, pp. 149–155.

1975 ◽  
Vol 40 (3) ◽  
pp. 458-458
Author(s):  
C. Lejewski
1959 ◽  
Vol 24 (3) ◽  
pp. 236-238
Author(s):  
William Craig

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