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References:
[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. MR 0158946 | 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. MR 0062741 | Zbl 0057.01702
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