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diff --git a/ref.bib b/ref.bib
index 2d11c83..69503ee 100644
--- a/ref.bib
+++ b/ref.bib
@@ -1880,3 +1880,12 @@ issn="1432-1378",
   year={2015},
   organization={IEEE}
 }
+
+@inproceedings{brickell1995trustee,
+  title={Trustee-based Tracing Extensions to Anonymous Cash and the Making of Anonymous Change.},
+  author={Brickell, Ernest F and Gemmell, Peter and Kravitz, David W},
+  booktitle={SODA},
+  volume={95},
+  pages={457--466},
+  year={1995}
+}