@article{AIF_1996__46_4_971_0,
     author = {Guieu, Laurent},
     title = {Nombre de rotation, structures g\'eom\'etriques sur un cercle et groupe de {Bott-Virasoro}},
     journal = {Annales de l'Institut Fourier},
     pages = {971--1009},
     publisher = {Association des Annales de l{\textquoteright}institut Fourier},
     volume = {46},
     number = {4},
     year = {1996},
     doi = {10.5802/aif.1537},
     mrnumber = {98b:22037},
     zbl = {0853.17022},
     language = {fr},
     url = {http://archive.numdam.org/articles/10.5802/aif.1537/}
}