Add SIGCOMM'23 paper.

Author: NullHypothesis

header.tpl

@@ -189,7 +189,7 @@
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-            href="https://github.com/NullHypothesis/censorbib/commits/master">Last update: 2023-07-16</a>
+            href="https://github.com/NullHypothesis/censorbib/commits/master">Last update: 2023-08-23</a>
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references.bib

@@ -1,3 +1,12 @@
+@inproceedings{Bischof2023a,
+	author = {Zachary S. Bischof and Kennedy Pitcher and Esteban Carisimo and Amanda Meng and Rafael Bezerra Nunes and Ramakrishna Padmanabhan and Margaret E. Roberts and Alex C. Snoeren and Alberto Dainotti},
+	title = {Destination Unreachable: Characterizing {Internet} Outages and Shutdowns},
+	booktitle = {SIGCOMM},
+	publisher = {ACM},
+	year = {2023},
+	url = {https://cseweb.ucsd.edu/~snoeren/papers/shutdown-sigcomm23.pdf},
+}
+
 @inproceedings{Brown2023a,
 	author     = {Jacob Brown and Xi Jiang and Van Tran and Arjun Nitin Bhagoji and Nguyen Phong Hoang and Nick Feamster and Prateek Mittal and Vinod Yegneswaran},
 	title      = {Augmenting Rule-based {DNS} Censorship Detection at Scale with Machine Learning},