On a class of II_1 factors with at most one Cartan subalgebra II
  This is a continuation of our previous paper studying the structure of Cartan subalgebras of von Neumann factors of type II_1. We provide more examples of II_1 factors having either zero, one or several Cartan subalgebras. We also prove a rigidity result for some group measure space II_1 factors. 
Narutaka Ozawa and Sorin Popa