A. I. Mal′cev. Efféktivnaá néotdélimost′ množéslva toždéstvénno istinnyh i množèstva konéčno oprovéržimyh formul eléméntamyh téorij. Doklady Akadémii Nauk SSSR, vol. 139 (1961), pp. 802–805. - A. I. Mal′cev. Effective inseparability of the set of identically true from the set of finitely refutable formulae of certain elementary theories. English translation of the preceding by Elliott Mendelson. Soviet mathematics, vol. 2 no. 4 (for 1961, pub. 1962), pp. 1005–1008.
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