I. N. Hlodovskij. Novoé dokazatél′stvo néprotivoréčivosti arifmétiki. Uspéhi matématičéskih nauk, vol. 14 no. 6 (1959), pp. 105–140. - I. N. Hlodovskií. A new proof of the consistency of arithmetic. English translation of the preceding by Moshe Machover. American Mathematical Society translations, ser. 2 vol. 23 (1963), pp. 191–230.
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