diff --git a/OneHundredYearCryptography.md b/OneHundredYearCryptography.md
index e6df40f..254bef2 100644
--- a/OneHundredYearCryptography.md
+++ b/OneHundredYearCryptography.md
@@ -21,5 +21,10 @@ We'll combine two hash functions using the Comb4P hash function combiner, which
 
 ## Signatures
 
-David-Sarah has proposed to use hash-based digital signatures. Zooko summarized David-Sarah's proposal here:
-<http://tahoe-lafs.org/pipermail/tahoe-dev/2010-June/004439.html>
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+David-Sarah has proposed to use hash-based digital signatures.
+ * [Bibliography#Hash-BasedDigitalSignatures](Bibliography#Hash-BasedDigitalSignatures)
+ * <http://tahoe-lafs.org/pipermail/tahoe-dev/2010-June/004439.html>
+ * <http://tahoe-lafs.org/pipermail/tahoe-dev/2010-June/004496.html>
+ * <http://tahoe-lafs.org/pipermail/tahoe-dev/2010-June/004497.html>
+ * <http://tahoe-lafs.org/pipermail/tahoe-dev/2010-June/004509.html>
+ * <http://tahoe-lafs.org/pipermail/tahoe-dev/2010-July/004587.html>
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