A. V. Gladkij. O raspoznavanii zaméščaémosti v rékursivnyh ázykah. Algébra i logika, Séminar, vol. 2 no. 3 (1963), pp. 5–22. - A. V. Gladkii. On the recognition of replaceability in recursive languages. English translation of the above by M. Greendlinger. American Mathematical Society translations, ser. 2 vol. 64 (1967), pp. 81–96.
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