1. L. Guillopé, ``Fonctions zêta de Selberg et surfaces de géométrie finie'' in Zeta Functions in Geometry (Tokyo, 1990), Adv. Stud. Pure Math. 21, Kinokuniya, Tokyo, 1992, 33--70.
2. R. R. Mazzeo and R. B. Melrose, Meromorphic extension of the resolvent on complete spaces with asymptotically constant negative curvature, J. Funct. Anal. 75 (1987), 260--310.
3. R. B. Melrose, Geometric Scattering Theory, Stanford Lectures, Cambridge Univ. Press, Cambridge, 1995.
4. M. E. Taylor, Pseudodifferential Operators, Princeton Math. Ser. 34, Princeton Univ. Press, Princeton, 1981.
5. D. Borthwick and P. Perry, Scattering poles for asymptotically hyperbolic manifolds, Trans. Amer. Math. Soc. 354 (2002), 1215--1231.