420 15. Group von Neumann Algebras
15.4. References
This chapter grew out of [133, 137, 135], which contain some additional
results. It would be nice to eliminate the exactness assumption from The-
orem 15.1.5. Theorem 15.3.10 and its corollaries were obtained by Popa
[161], who used completely different methods which did not require exact-
ness. Theorem 15.3.13 and its corollaries also have stronger versions, due
to Ioana, Peterson and Popa [89] and Peterson [143], which do not require
exactness.