Laikanok, R., P. Uthansakul, and M. Uthansakul. “Self-Evaluation Guideline of Overlapping Spectrum Sharing for Multi-User MIMO Cognitive Radio Systems”. Engineering and Applied Science Research, vol. 46, no. 1, Mar. 2019, pp. 1-9, https://ph01.tci-thaijo.org/index.php/easr/article/view/110663.