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--- a/debian/upstream/metadata
+++ b/debian/upstream/metadata
@@ -10,4 +10,10 @@ Reference:
   Pages: 1--20
   Year: 2017
   Publisher: ACM New York, NY, USA
+Reference:
+  Title: "Efficient Approximation of the Matching Distance for 2-parameter persistence"
+  Author: Kerber, Michael and Nigmetov, Arnur
+  Year: 2020
+  Type: inproceedings
+  Journal: SoCG 2020