no. 2
Ends of groups and baseless subgroups of wreath products
Compositio Mathematica, Tome 27 (1973) no. 2, pp. 205-211 
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     zbl = {0273.20032},
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     url = {https://www.numdam.org/item/CM_1973__27_2_205_0/}
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Houghton, C. H. Ends of groups and baseless subgroups of wreath products. Compositio Mathematica, Tome 27 (1973) no. 2, pp. 205-211. https://www.numdam.org/item/CM_1973__27_2_205_0/

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[2] B. Hartley: Complements, baseless subgroups and Sylow subgroups of infinite wreath products. Compositio Mathematica, 26 (1973) 3-30. | Zbl | MR | Numdam

[3] C.H. Houghton: Ends of groups and the associated first cohomology groups. J. London Math. Soc., 6 (1972) 81-92. | Zbl | MR

[4] E. Specker: Endenverbände von Räumen und Gruppen. Math. Ann. 122 (1950) 167-174. | Zbl | MR

[5] J. Stallings: Group theory and three-dimensional manifolds. Yale Mathematical Monographs, 4. (Yale University Press, New Haven, 1971). | Zbl | MR