Need PCSS demo/code

Hello to you all. I need an application/demo that implements the percentage-closer soft shadows (PCSS) technique for academical purpouses. I would be very grateful if someone could send me such software.

Thank you in advance.

It’s on the nVidia developer demos page:

I also suggest these more advanced shadow technique

Hi, the problem is that I need explicitly a dome implements the PCSS algorithm. Where can I get that?