1. Amazon: CUDA on AWS. http://aws.amazon.com/articles/7249489223918169
2. AMD. http://developer.amd.com/tools-and-sdks/opencl-zone/
3. Anonymous: Once upon a free(). http://phrack.org/issues/57/9.html
4. Flux Research Group, University of Utah: KGPU. https://code.google.com/p/kgpu/
5. Khronos Group: OpenCL. http://www.khronos.org/opencl/