diff --git a/header.tpl b/header.tpl
index 8ce0d53..63498d2 100644
--- a/header.tpl
+++ b/header.tpl
@@ -86,7 +86,7 @@
       (<a href="author_reverse.html">reverse</a>) <a href="author.html">author</a> <br />
       Feedback: <a href="mailto:phw@nymity.ch">phw@nymity.ch</a> (<a
       href="https://nymity.ch/openpgp_public_key.txt">OpenPGP</a>) <br />
-      Last updated: <a href="https://github.com/NullHypothesis/censorbib/commits/master">2019-04-06</a> <br />
+      Last updated: <a href="https://github.com/NullHypothesis/censorbib/commits/master">2019-08-13</a> <br />
       Onion site: <a href="http://3wcwjjnuvjyazeza.onion">3wcwjjnuvjyazeza.onion</a> <br />
       Code: <a href="https://github.com/NullHypothesis/censorbib">GitHub</a>
     </div>
diff --git a/references.bib b/references.bib
index 7dd5398..abd90e2 100644
--- a/references.bib
+++ b/references.bib
@@ -1,3 +1,39 @@
+@inproceedings{Sheffey2019a,
+	author = {Steven R. Sheffey and Ferrol Aderholdt},
+	title = {Improving Meek With Adversarial Techniques},
+	booktitle = {Free and Open Communications on the Internet},
+	publisher = {USENIX},
+	year = {2019},
+	url = {https://www.usenix.org/system/files/foci19-paper_sheffey.pdf},
+}
+
+@inproceedings{Chai2019a,
+	author = {Zimo Chai and Amirhossein Ghafari and Amir Houmansadr},
+	title = {On the Importance of Encrypted-{SNI} ({ESNI}) to Censorship Circumvention},
+	booktitle = {Free and Open Communications on the Internet},
+	publisher = {USENIX},
+	year = {2019},
+	url = {https://www.usenix.org/system/files/foci19-paper_chai_update.pdf},
+}
+
+@inproceedings{Knockel2019a,
+	author = {Ruohan Xiong and Jeffrey Knockel},
+	title = {An Efficient Method to Determine which Combination of Keywords Triggered Automatic Filtering of a Message},
+	booktitle = {Free and Open Communications on the Internet},
+	publisher = {USENIX},
+	year = {2019},
+	url = {https://www.usenix.org/system/files/foci19-paper_xiong.pdf},
+}
+
+@inproceedings{Hoang2019a,
+	author = {Nguyen Phong Hoang and Sadie Doreen and Michalis Polychronakis},
+	title = {Measuring {I2P} Censorship at a Global Scale},
+	booktitle = {Free and Open Communications on the Internet},
+	publisher = {USENIX},
+	year = {2019},
+	url = {https://www.usenix.org/system/files/foci19-paper_hoang.pdf},
+}
+
 @inproceedings{Bocovich2017a,
 	author = {Cecylia Bocovich and John A. Doucette and Ian Goldberg},
 	title = {{Lavinia}: An audit-payment protocolfor censorship-resistant storage},