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@article{IM_1992__110_2_144065, author = {Richard Schwartz}, title = {A projectively natural flow for circle diffeomorphisms.}, journal = {Inventiones mathematicae}, pages = {627--648}, publisher = {mathdoc}, volume = {110}, number = {2}, year = {1992}, zbl = {0773.58022}, url = {http://geodesic.mathdoc.fr/item/IM_1992__110_2_144065/} }
Richard Schwartz. A projectively natural flow for circle diffeomorphisms.. Inventiones mathematicae, Tome 110 (1992) no. 2, pp. 627-648. http://geodesic.mathdoc.fr/item/IM_1992__110_2_144065/