N. N. Vorob'év. Probléma vyvodimosti v konstruktivnom isčislénii vyskazyvanij s sil'nym otricaniém (The problem of deducibility in the constructive propositional calculus with strong negation). Doklady Akadémii Nauk SSSR, vol. 85 (1952), pp. 689–692.

1953 ◽  
Vol 18 (3) ◽  
pp. 258-258
Author(s):  
Andrzej Mostowski
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