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@article{MZ_1993__214_1_174579, author = {Wolfgang Woess}, title = {Fixed sets and free subgroups of groups acting on metric spaces.}, journal = {Mathematische Zeitschrift}, pages = {425--440}, publisher = {mathdoc}, volume = {214}, number = {1}, year = {1993}, zbl = {0892.54022}, url = {http://geodesic.mathdoc.fr/item/MZ_1993__214_1_174579/} }
Wolfgang Woess. Fixed sets and free subgroups of groups acting on metric spaces.. Mathematische Zeitschrift, Tome 214 (1993) no. 1, pp. 425-440. http://geodesic.mathdoc.fr/item/MZ_1993__214_1_174579/