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Research of both authors supported by the Swiss National Science foundation
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Burger, M., Schroeder, V. Amenable groups and stabilizers of measures on the boundary of a Hadamard manifold. Math. Ann. 276, 505–514 (1987). https://doi.org/10.1007/BF01450845
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DOI: https://doi.org/10.1007/BF01450845