It’s funny that you mention this. The most helpful research papers I’ve read have been written by private companies. Here’s a couple off the top of my head[0][1]. Short and straight to the point.

[0]: https://steamcdn-a.akamaihd.net/apps/valve/2007/SIGGRAPH2007...

[1]: https://developer.download.nvidia.com/devzone/devcenter/game...