Wu, Jin Song et Wu, Wen Ming, Similarity degrees for the crossed product of von Neumann algebras, Acta mathematica Sinica. English series (Print) , 30(5), 2014, pp. 723-736
In this paper, we will estimate an upper bound for the similarity degree of the crossed product of a hyperfinite finite von Neumann algebra by weakly compact action of an infinite discrete group. We will also improve some upper bounds for similarity degrees of some finite von Neumann algebras.