@article{MAN_1992__294_4_165000,
     author = {J. Barge and E. Ghys},
     title = {Cocycles {d'Euler} et de {Maslov.}},
     journal = {Mathematische Annalen},
     pages = {235--266},
     year = {1992},
     volume = {294},
     number = {4},
     url = {http://geodesic.mathdoc.fr/item/MAN_1992__294_4_165000/}
}