+@misc{texdraft,
+ title={Preliminary preliminary description of {\TeX}},
+ author={Knuth, Donald},
+ year={1977},
+ howpublished={\url{http://www.saildart.org/TEXDR.AFT[1,DEK]1}}
+}
+
+@article{fuchs1982theformat,
+ title={The Format of {\TeX}'s {DVI} files},
+ author={Fuchs, David},
+ year={1982},
+ journal={TUGBoat},
+ volume={3},
+ number={2},
+ howpublished={\url{http://www.tug.org/TUGboat/Articles/tb03-2/tb06software.pdf}}
+}
+
+% HTML 2 spec
+@article{html2rfc,
+ title={Hypertext Markup Language -- 2.0},
+ author={Berners-Lee, Tim and Connolly, Daniel},
+ year={1995},
+ journal={Internet RFC 1866}
+}
+
+% CSS 2 spec
+@misc{css2spec,
+ title={Cascading Style Sheets, Level 2, {CSS2} Specification},
+ author={Bos, Bert and Wium Lie, Håkon and Lilley, Chris and Jacobs Ian},
+ date={1998},
+ howpublished={\url{http://www.w3.org/TR/1998/REC-CSS2-19980512/}}
+}
+
+@misc{ghostscript,
+ title={GhostScript, an interpreter for the PostScript language and PDF},
+ author={Artifex Software},
+ year={1988},
+ howpublished={\url{http://www.ghostscript.com/}}
+}
+