G. Hasenjaeger. On definability and derivability. Mathematical interpretation of formal systems, Studies in logic and the foundations of mathematics, North-Holland Publishing Company, Amsterdam1955, pp. 15–25.

1959 ◽  
Vol 24 (2) ◽  
pp. 171-172
Author(s):  
Thomas Frayne
1959 ◽  
Vol 24 (3) ◽  
pp. 236-238
Author(s):  
William Craig

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