Higher homotopy excision and Blakers-Massey theorems for structured ring   spectra
  Working in the context of symmetric spectra, we prove higher homotopy excision and higher Blakers-Massey theorems, and their duals, for algebras and left modules over operads in the category of modules over a commutative ring spectrum (e.g., structured ring spectra). 
Michael Ching and John E. Harper
math.AT