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-rw-r--r--networkx/algorithms/isomorphism/isomorphvf2.py2
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diff --git a/networkx/algorithms/isomorphism/isomorphvf2.py b/networkx/algorithms/isomorphism/isomorphvf2.py
index 424a04cb..bcd478eb 100644
--- a/networkx/algorithms/isomorphism/isomorphvf2.py
+++ b/networkx/algorithms/isomorphism/isomorphvf2.py
@@ -116,7 +116,7 @@ References
Algorithm for Matching Large Graphs", 3rd IAPR-TC15 Workshop
on Graph-based Representations in Pattern Recognition, Cuen,
pp. 149-159, 2001.
- http://amalfi.dis.unina.it/graph/db/papers/vf-algorithm.pdf
+ https://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.101.5342
See Also
--------