@incollection{JEDP_1987____A17_0,
     author = {Agmon, Shmuel},
     title = {On the spectral theory of the laplacian on noncompact hyperbolic manifolds},
     booktitle = {},
     series = {Journ\'ees \'equations aux d\'eriv\'ees partielles},
     eid = {17},
     pages = {1--16},
     publisher = {Ecole polytechnique},
     year = {1987},
     mrnumber = {89c:58128},
     zbl = {0636.58037},
     language = {en},
     url = {http://archive.numdam.org/item/JEDP_1987____A17_0/}
}