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@article{MZ_1970__114_171291, author = {Daniel E. Cohen}, title = {Ends and {Free} {Products} of {Groups.}}, journal = {Mathematische Zeitschrift}, pages = {9--18}, publisher = {mathdoc}, volume = {114}, year = {1970}, zbl = {0177.03501}, url = {http://geodesic.mathdoc.fr/item/MZ_1970__114_171291/} }
Daniel E. Cohen. Ends and Free Products of Groups.. Mathematische Zeitschrift, Tome 114 (1970), pp. 9-18. http://geodesic.mathdoc.fr/item/MZ_1970__114_171291/