message: correction of bibliography
diff: @@ -9,7 +9,7 @@ Definition
  .. include:: wasserstein_distance_sum.inc
  -This implementation is based on ideas from "Large Scale Computation of Means and Cluster for Persistence Diagrams via Optimal Transport".
  +This implementation is based on ideas from "Frechet means for distribution of persistence diagrams", Turner et al. 2014.
  Function
  --------
  