Make a few format fixes.

Author: NullHypothesis

references.bib

@@ -1,13 +1,13 @@
 @techreport{Ptacek1998a,
-  author={Thomas H. Ptacek and Timothy N. Newsham},
-  title={Insertion, Evasion, and Denial of Service: Eluding Network Intrusion Detection},
-  year={1998},
-  url={https://www.icir.org/vern/Ptacek-Newsham-Evasion-98.pdf},
+  author = {Thomas H. Ptacek and Timothy N. Newsham},
+  title = {Insertion, Evasion, and Denial of Service: Eluding Network Intrusion Detection},
+  year = {1998},
+  url = {https://www.icir.org/vern/Ptacek-Newsham-Evasion-98.pdf},
 }
 
 @inproceedings{Handley2001a,
-  author={Mark Handley and Vern Paxson and Christian Kreibich},
-  title={Network Intrusion Detection: Evasion, Traffic Normalization, and {End-to-End} Protocol Semantics},
+  author = {Mark Handley and Vern Paxson and Christian Kreibich},
+  title = {Network Intrusion Detection: Evasion, Traffic Normalization, and End-to-End Protocol Semantics},
   booktitle = {USENIX Security Symposium},
   publisher = {USENIX},
   year = {2001},