Categorical centers and Reshetikhin-Turaev invariants
  The center Z(C) of a spherical fusion category C (over an arbitrary commutative ring) is modular. We give an algorithm for computing the Reshetikhin-Turaev invariant defined with Z(C). It is based on Hopf diagrams and an explicit description of the structure of the coend of Z(C). 
Alain Brugui\`eres and Alexis Virelizier