Update README.md

Author: tsengyushiang

README.md

@@ -41,3 +41,4 @@ For further details, you can read the source code of the [fragmenet shader](./pa
 - [ray-triangle intersection](https://stackoverflow.com/questions/59257678/intersect-a-ray-with-a-triangle-in-glsl-c)
 - [3D volume rendering with WebGL / Three.js](https://observablehq.com/@mroehlig/3d-volume-rendering-with-webgl-three-js)
 - [WINNER II channel models A1 NLOS](https://www.researchgate.net/publication/234055761_WINNER_II_channel_models)
+- [WaveRider: Immersive Visualization of Indoor Signal Propagation](https://scispace.com/pdf/waverider-immersive-visualization-of-indoor-signal-sx0ghmnvx9.pdf)