A scattering theory for automorphic functions
Séminaire Équations aux dérivées partielles (Polytechnique) dit aussi "Séminaire Goulaouic-Schwartz" (1973-1974), Exposé no. 23, 7 p. 
@article{SEDP_1973-1974____A21_0,
     author = {Lax, P. D. and Phillips, R. S.},
     title = {A scattering theory for automorphic functions},
     journal = {S\'eminaire \'Equations aux d\'eriv\'ees partielles (Polytechnique) dit aussi "S\'eminaire Goulaouic-Schwartz"},
     note = {talk:23},
     pages = {1--7},
     publisher = {Ecole Polytechnique, Centre de Math\'ematiques},
     year = {1973-1974},
     mrnumber = {407626},
     zbl = {0297.35061},
     language = {en},
     url = {http://archive.numdam.org/item/SEDP_1973-1974____A21_0/}
}
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Lax, P. D.; Phillips, R. S. A scattering theory for automorphic functions. Séminaire Équations aux dérivées partielles (Polytechnique) dit aussi "Séminaire Goulaouic-Schwartz" (1973-1974), Exposé no. 23, 7 p. http://archive.numdam.org/item/SEDP_1973-1974____A21_0/

[1] L.D. Faddeev: Expansions in eigenfunctions of the Laplace operator in the fundamental domain of a discrete group on the Lobacevski plane, Trudy (1967) 357-386. | Zbl

[2] L.D. Faddeev and B.S. Pavlov: Scattering theory and automorphic functions, Seminar of Steklov math. Inst. of Leningrad, vol.27 (1972) 161-193. | MR | Zbl

[3] P.D. Lax and R.S. Phillips: Scattering theory, Academic Press 1967. | MR | Zbl

[4] P.D. Lax and R.S. Phillips: The acoustic equation with an indefinite energy form and the Schrödinger equation, J. Functional Analysis, vol.1 (1967) 37-83. | MR | Zbl