@article{1077491224, author = {Hedlund, Gustav A.}, title = {The measure of geodesic types on surfaces of negative curvature}, journal = {Duke Math. J.}, volume = {5}, number = {1}, year = {1939}, pages = { 230-248}, language = {en}, url = {http://dml.mathdoc.fr/item/1077491224} }
Hedlund, Gustav A. The measure of geodesic types on surfaces of negative curvature. Duke Math. J., Tome 5 (1939) no. 1, pp. 230-248. http://gdmltest.u-ga.fr/item/1077491224/