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-rw-r--r--src/python/doc/wasserstein_distance_user.rst14
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diff --git a/src/python/doc/wasserstein_distance_user.rst b/src/python/doc/wasserstein_distance_user.rst
index a049cfb5..13f6f1af 100644
--- a/src/python/doc/wasserstein_distance_user.rst
+++ b/src/python/doc/wasserstein_distance_user.rst
@@ -9,12 +9,20 @@ 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".
+Functions
+---------
+This implementation is based on ideas from "Large Scale Computation of Means
+and Cluster for Persistence Diagrams via Optimal Transport".
-Function
---------
.. autofunction:: gudhi.wasserstein.wasserstein_distance
+This other implementation comes from `Hera
+<https://bitbucket.org/grey_narn/hera/src/master/>`_ and is based on `"Geometry
+Helps to Compare Persistence Diagrams."
+<http://dx.doi.org/10.1137/1.9781611974317.9>`_ by Michael Kerber, Dmitriy
+Morozov, and Arnur Nigmetov, at ALENEX 2016.
+
+.. autofunction:: gudhi.hera.wasserstein_distance
Basic example
-------------