MathSciNet bibliographic data MR2019974 (2004j:22011) 22E40 (53C35 58J50) Leuzinger, Enrico Critical exponents of discrete groups and \$L\sp 2\$$L\sp 2$-spectrum. Proc. Amer. Math. Soc. 132 (2004), no. 3, 919–927 (electronic). Article

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