@article{IM_1978__45_142540,
     author = {H. Donnelly},
     title = {On the {Wave} {Equation} {Asymptotics} of a {Compact} {Negatively} {Curved} {Surface.}},
     journal = {Inventiones mathematicae},
     pages = {115--138},
     publisher = {mathdoc},
     volume = {45},
     year = {1978},
     zbl = {0382.53039},
     url = {http://geodesic.mathdoc.fr/item/IM_1978__45_142540/}
}