@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/