@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/}
}