Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{IM_1984__77_143155, author = {P. Sarnak and R. Osserman}, title = {A new curvature invariant and entropy of geodesic flow.}, journal = {Inventiones mathematicae}, pages = {455--462}, publisher = {mathdoc}, volume = {77}, year = {1984}, zbl = {0536.53048}, url = {http://geodesic.mathdoc.fr/item/IM_1984__77_143155/} }
P. Sarnak; R. Osserman. A new curvature invariant and entropy of geodesic flow.. Inventiones mathematicae, Tome 77 (1984), pp. 455-462. http://geodesic.mathdoc.fr/item/IM_1984__77_143155/