MathSciNet bibliographic data

MR1489886 (99b:57002) 57M05 (20F05 55N25 55P20) Eckmann, Beno $4$-manifolds, group invariants, and $l\sb 2$-Betti numbers. Enseign. Math. (2) 43 (1997), no. 3-4, 271--279.

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