F. L. Varpahovskij. О néréalizuémosti dizúnkcii néréalizuémyh formul logiki vyskazyvanij. Doklady Akadémii Nauk SSSR, vol. 161 (1965), pp. 1257–1258. - F. L. Varpahovskij. The nonrealizability of a disjunction of nonrealizable formulas of propositional logic. English translation of the preceding by Elliott Mendelson. Soviet mathematics, vol. 6 No. 2 (1965), pp. 568–570.

1967 ◽  
Vol 32 (3) ◽  
pp. 396-396
Author(s):  
D. Nelson
1983 ◽  
Vol 48 (2) ◽  
pp. 488-495 ◽  
Author(s):  
R. A. Bull

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