Voir la notice de l'article provenant de la source Math-Net.Ru
@article{MZM_1990_48_5_a6, author = {V. V. Kozlov}, title = {Groups of symmetries of geodesic flows on closed surfaces}, journal = {Matemati\v{c}eskie zametki}, pages = {62--67}, publisher = {mathdoc}, volume = {48}, number = {5}, year = {1990}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1990_48_5_a6/} }
V. V. Kozlov. Groups of symmetries of geodesic flows on closed surfaces. Matematičeskie zametki, Tome 48 (1990) no. 5, pp. 62-67. http://geodesic.mathdoc.fr/item/MZM_1990_48_5_a6/