add backlinks to other repos

README.md

@@ -38,4 +38,13 @@ npm run dev
 
  - [Will Usher](https://github.com/Twinklebear/webgl-marching-cubes) ported [Marching Cubes](https://paulbourke.net/geometry/polygonise/) to JavaScript.
  - This project includes a pure JavaScript port of Sven Forstmann's [Fast Quadric Mesh Simplification](https://github.com/sp4cerat/Fast-Quadric-Mesh-Simplification)
- - [Tim Knip](https://github.com/timknip/mesh-decimate/tree/master) provides a ThreeJS project that provides both WASM and native JavaScript mesh decimation. Try the [live demo](https://neurolabusc.github.io/simplifyjs/).
+ - [Tim Knip](https://github.com/timknip/mesh-decimate/tree/master) provides a ThreeJS project that provides both WASM and native JavaScript mesh decimation. Try the [live demo](https://neurolabusc.github.io/simplifyjs/).
+
+
+## References
+
+### Our group's open source software used in this applicaiton
+
+- [brainchop](https://github.com/neuroneural/brainchop)
+- [niivue](https://github.com/niivue/niivue)
+- [niimath](https://github.com/rordenlab/niimath)