David Schedl, Michael Wimmer
Simulating partial occlusion in post-processing depth-of-field methods
In GPU Pro 4: Advanced Rendering Techniques, pages 187-200, March 2013
[Paper]
David Schedl, Michael Wimmer
A layered depth-of-field method for solving partial occlusion
Journal of WSCG, 20(3):239-246, June 2012. [paper]