Your search returned the following 3 documents:

3. Real-Time Screen-Space Scattering in Homogeneous Environments
   Oskar Elek, Tobias Ritschel, and Hans-Peter Seidel
   Computer Graphics and Applications, IEEE 33 (3): 1-10, 2013
   
2. Interactive cloud rendering using temporally-coherent photon mapping
   Oskar Elek, Tobias Ritschel, Alexander Wilkie, and Hans-Peter Seidel
   Computers & Graphics 36 (8): 1109-1118, 2012
   
1. Interactive cloud rendering using temporally-coherent photon mapping
   Oskar Elek, Tobias Ritschel, Alexander Wilkie, and Hans-Peter Seidel
   In: Proceedings of Graphics Interface 2012, Toronto, Canada, 2012, 141-148