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@article{MOMA_1989__107_3_178424, author = {Claudio Nebbia}, title = {A {Note} on the {Amenable} {Subgroups} of {PSL} (2, {R).}}, journal = {Monatshefte f\"ur Mathematik}, pages = {241--244}, publisher = {mathdoc}, volume = {107}, number = {3}, year = {1989}, zbl = {0679.43008}, url = {http://geodesic.mathdoc.fr/item/MOMA_1989__107_3_178424/} }
Claudio Nebbia. A Note on the Amenable Subgroups of PSL (2, R).. Monatshefte für Mathematik, Tome 107 (1989) no. 3, pp. 241-244. http://geodesic.mathdoc.fr/item/MOMA_1989__107_3_178424/