Add related notes and papers

README.md

@@ -5,3 +5,13 @@
 - Network transparent
 - Reimplementable
 - Display device agnostic (LCD, E-ink, ocular-bypass)
+
+## Further reading
+ * [Eaglemode](http://eaglemode.sourceforge.net/)
+ * [Pad++](./doc/spe-98-padimplementation.pdf)
+ * [A2](https://en.wikipedia.org/wiki/A2_(operating_system))
+ * [Sigma Lenses: Focus-Context Transitions Combining Space, Time and Translucence](https://hal.inria.fr/inria-00271301)
+ * [Approaches for visualizing large graphs](https://notes.andymatuschak.org/Approaches_for_visualizing_large_graphs)
+ * [ZVTM](http://zvtm.sourceforge.net/)
+ * [Archy](https://en.wikipedia.org/wiki/Archy_(software))
+ * [ZOOMABLE USER INTERFACES IN SCALABLE VECTOR GRAPHICS ](./doc/SvgOpen2007.pdf)