This scene is the chess scene used for Figure 8 in "Multidimensional Adaptive Sampling and Reconstruction for Ray Tracing" by Hachisuka et al. SIGGRAPH 2008, and was modeled by Wojciech Jarosz.

Permission to use the model/scene for non-commercial purposes is granted as long as proper credit is given. For example, put "The chess scene in Figure X is from Hackisuka et al. [2008] and was modeled by Wojciech Jarosz." 
in the acknowledgement section of your paper.