https://www.youtube.com/watch?v=8D6yhpiQVVI
http://www.fixstars.com/en/opencl/book/OpenCLProgrammingBook/opencl-c/
http://www.informit.com/articles/article.aspx?p=1732873
http://www.browndeertechnology.com/docs/BDT_OpenCL_Tutorial_NBody-rev3.html
