Comparison of models for $(\infty, n)$-categories, II
  In this paper we complete a chain of explicit Quillen equivalences between the model category for $\Theta_{n+1}$-spaces and the model category of small categories enriched in $\Theta_n$-spaces. The Quillen equivalences given here connect Segal category objects in $\Theta_n$-spaces, complete Segal objects in $\Theta_n$-spaces, and $\Theta_{n+1}$-spaces. 
Julia E. Bergner and Charles Rezk
math.AT math.CT