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Periodic series. (English) Zbl 0159.30603

group theory
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[1] Wiegold J.: Semigroup coverings of groups. Mat.-fyz. časop. 11 (1961), 3-13. · Zbl 0104.01902
[2] Wiegold J.: Semigroup coverings of groups II. Mat.-fyz. časop. 12 (1962), 217-223. · Zbl 0161.02101
[3] Neumann B. H.: An essay on free products of groups with amalgamations. Phil. Trans. Roy. Soc. London Ser. A 246 (1954), 503-554. · Zbl 0057.01702
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