Stig Kanger. A simplified proof method for elementary logic. Computer programming and formal systems, edited by P. Braffort and D. Hirschberg, Studies in logic and the foundations of mathematics, North-Holland Publishing Company, Amsterdam1963, pp. 87–94.

1967 ◽  
Vol 32 (1) ◽  
pp. 119-119
Author(s):  
J. A. Robinson
1959 ◽  
Vol 24 (3) ◽  
pp. 236-238
Author(s):  
William Craig

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