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P. J. Nicholls. The Ergodic Theory of Discrete Groups. Cambridge University Press, 1989.

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D. Sullivan. On the ergodic theory at infinity of an arbitrary discrete group of hyperbolic motions. In I. Kra and B. Maskit, editors, Riemann Surfaces and Related Topics: Proceedings of the 1978 Stony Brook Conference. Annals of Math. Studies 97, Princeton, 1981.

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