diff --git a/Bibliography.md b/Bibliography.md
index 7ee3d3c..bb4a4c5 100644
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+++ b/Bibliography.md
@@ -5,6 +5,12 @@ Here are some papers that are potentially of interest.
 
 ### Symmetric Primitives
 
+#### Hash Functions
+
+[On the Security of Hash Function Combiners](http://tuprints.ulb.tu-darmstadt.de/2094/1/thesis.lehmann.pdf) Anja Lehman's dissertation on hash function combiners
+
+#### Ciphers
+
 [Salsa20 Design](http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.59.9522) a fast and secure cipher
 
 [Salsa20 Security Arguments](http://cr.yp.to/snuffle.html#security) why Salsa20 is probably safe against this and that threat