Doc: note availability of Google's implementation

aschampion · Dec 5, 2017 · 0a75c40 · 0a75c40
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@@ -21,6 +21,8 @@ locations along the boundary of the current field of view that are confidently
 inside the region. This process is repeated until the region has been fully
 explored.
 
+As of December 2017 the original paper's authors have released `their implementation <https://github.com/google/ffn>`_.
+
 
 Quick Start
 -----------