@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/