Your search returned the following 3 documents:

3. Efficient Online Visibility for Shadow Maps
   Oliver Mattausch, Jiri Bittner, Ari Silvennoinen, Daniel Scherzer, and Michael Wimmer
   In: GPU Pro 3: Advanced Rendering Techniques, 2012, 233-242
   
2. Screen-space Bent Cones: A Practical Approach
   Oliver Klehm, Tobias Ritschel, Elmar Eisemann, and Hans-Peter Seidel
   In: GPU Pro 3: Advanced Rendering Techniques, 2012, 191-207
   
1. Volumetric Real-Time Water and Foam Rendering
   Daniel Scherzer, Florian Bagar, and Oliver Mattausch
   In: GPU Pro 3: Advanced Rendering Techniques, 2012, 119-132