@article{GDZPPN002110423, title = {A projectively natural flow for circle diffeomorphisms.}, journal = {Inventiones mathematicae}, volume = {110}, year = {1992}, pages = {627-648}, zbl = {0773.58022}, url = {http://dml.mathdoc.fr/item/GDZPPN002110423} }
Schwartz, Richard. A projectively natural flow for circle diffeomorphisms.. Inventiones mathematicae, Tome 110 (1992) pp. 627-648. http://gdmltest.u-ga.fr/item/GDZPPN002110423/