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@article{MZ_1972__127_171773, author = {Peter C. Oxley}, title = {Ends and {Amalgamated} {Free} {Products} of {Groups.}}, journal = {Mathematische Zeitschrift}, pages = {265--272}, publisher = {mathdoc}, volume = {127}, year = {1972}, zbl = {0227.20010}, url = {http://geodesic.mathdoc.fr/item/MZ_1972__127_171773/} }
Peter C. Oxley. Ends and Amalgamated Free Products of Groups.. Mathematische Zeitschrift, Tome 127 (1972), pp. 265-272. http://geodesic.mathdoc.fr/item/MZ_1972__127_171773/