has been replaced by OpenCL, BrookGPU by Standford University~\cite{ch1:Buck:2004:BGS}.
Another environment based on pragma (insertion of pragma directives inside the
code to help the compiler to generate efficient code) is called OpenACC. For a
-comparison with OpenCL, interested readers may refer to~\cite{ch1:CMR:12}.
+comparison with OpenCL, interested readers may refer to~\cite{ch1:Dongarra}.