MathSciNet bibliographic data MR2601038 (2011j:46102) 46L10 (28D15 37A20) Popa, Sorin; Vaes, Stefaan Actions of $\Bbb F\sb \infty$$\Bbb F\sb \infty$ whose ${\rm II}\sb 1$${\rm II}\sb 1$ factors and orbit equivalence relations have prescribed fundamental group. J. Amer. Math. Soc. 23 (2010), no. 2, 383–403. Article

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