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  1.  14
    A. A. Fridman. Stépéni nérazréšimosti problémy toždéstva dlá konéčno-oprédélénnyh grupp . Izdatél′stvo “Nauka,”Moscow1967, 193 pp. [REVIEW]D. J. Collins - 1969 - Journal of Symbolic Logic 34 (1):114-115.
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  2.  7
    L. A. Bokut′. Ob odnom svojstvé grupp Buna . Algébra i logika, Séminar, vol. 5 no. 5 , pp. 5–23, and vol. 6 no. 1 , pp. 15–24. [REVIEW]D. J. Collins - 1968 - Journal of Symbolic Logic 33 (3):470-471.
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  3.  3
    Review: A. A. Fridman, Degrees of Unsolvability of the Word Problem for Finitely Defined Groups. [REVIEW]D. J. Collins - 1969 - Journal of Symbolic Logic 34 (1):114-115.
  4.  14
    Review: Ju. V. Matijasevic, Sue Walker, Simple Examples of Undecidable Associative Calculi. [REVIEW]D. J. Collins - 1968 - Journal of Symbolic Logic 33 (3):469-470.
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  5.  9
    Review: L. A. Bokut, On a Property of the Groups of Boone. [REVIEW]D. J. Collins - 1968 - Journal of Symbolic Logic 33 (3):470-471.
  6.  14
    Ú. V. Matiásévič. Prostyé priméry nérazréšimyh associativnyh isčislénij. Doklady Akadémii Nauk, vol. 173 , pp. 1264–1266. - Ju. V. Matijasevič. Simple examples of undecidable associative calculi. English translation of the preceding by Sue Walker. Soviet mathematics, vol. 8 no. 2 , pp. 555–557. [REVIEW]D. J. Collins - 1968 - Journal of Symbolic Logic 33 (3):469-470.
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