-performance per watt function is maximized. In the work of Kia Ma et al.~\cite{49},
-They developed a scheduling algorithm to distributed different workloads proportional
-to the computing power of the node to be executed on a CPU or a GPU, emphasize all tasks
-must be finished in the same time.
-Recently, Rong et al.~\cite{50}, Their study explain that a heterogeneous clusters enabled
-DVFS using GPUs and CPUs gave better energy and performance efficiency than other clusters
-composed of only CPUs. The CPUs-CPUs heterogeneous clusters consist of number of computing
-nodes all of the type CPU. Our work in this paper can be classified to this type of the
-clusters. As an example of this works see Naveen et al.~\cite{52} work, They developed a
-policy to dynamically assigned the frequency to a heterogeneous cluster. The goal is to
-minimizing a fixed metric of $energy*delay^2$. Where our proposed method is automatically
+performance per watt function is maximized. In the work of Kia Ma et al.
+~\cite{KaiMa_Holistic.Approach.to.Energy.Efficiency.in.GPU-CPU}, They developed a scheduling
+algorithm to distributed different workloads proportional to the computing power of the node
+to be executed on a CPU or a GPU, emphasize all tasks must be finished in the same time.
+Recently, Rong et al.~\cite{Rong_Effects.of.DVFS.on.K20.GPU}, Their study explain that
+a heterogeneous clusters enabled DVFS using GPUs and CPUs gave better energy and performance
+efficiency than other clusters composed of only CPUs.
+The CPUs-CPUs heterogeneous clusters consist of number of computing nodes all of the type CPU.
+Our work in this paper can be classified to this type of the clusters.
+As an example of this works see Naveen et al.~\cite{Naveen_Power.Efficient.Resource.Scaling} work,
+They developed a policy to dynamically assigned the frequency to a heterogeneous cluster.
+The goal is to minimizing a fixed metric of $energy*delay^2$. Where our proposed method is automatically