Boonta, C., P. Nakornrat, and N. Jinaporn. “RETRACTED: Design and Performance Evaluation of PEA IP over DWDM Core Networks”. Engineering and Applied Science Research, vol. 46, no. 3, Sept. 2019, pp. 227-3, https://ph01.tci-thaijo.org/index.php/easr/article/view/187865.