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diff --git a/comparison/literature.bib b/comparison/literature.bib
index 2242a60..de6bb04 100644
--- a/comparison/literature.bib
+++ b/comparison/literature.bib
@@ -182,4 +182,20 @@ url="https://doi.org/10.1007/3-540-44750-4_35"
  publisher = {ACM},
  address = {New York, NY, USA},
  keywords = {electronic commerce, payment systems, wireless applications},
+}
+
+
+@inproceedings{schoenmakers1997security,
+ author = {Schoenmakers, Berry},
+ title = {Security Aspects of the Ecash\&\#153; Payment System},
+ booktitle = {State of the Art in Applied Cryptography, Course on Computer Security and Industrial Cryptography - Revised Lectures},
+ year = {1998},
+ isbn = {3-540-65474-7},
+ location = {Leuven, Belgium},
+ pages = {338--352},
+ numpages = {15},
+ url = {http://dl.acm.org/citation.cfm?id=647443.726912},
+ acmid = {726912},
+ publisher = {Springer-Verlag},
+ address = {London, UK, UK},
 }