MathSciNet bibliographic data MR2197826 (2008a:46070) 46L85 (37A20) Sauer, Roman \$L\sp 2\$$L\sp 2$-Betti numbers of discrete measured groupoids. Internat. J. Algebra Comput. 15 (2005), no. 5-6, 1169–1188. Article

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