Li Zhi, T., H. King Ung, C. Kon, and K. J. . Chuan. “Investigation of Multiple Transceiver System for Free Space Optical Communication”. International Journal of Integrated Engineering, vol. 13, no. 2, Dec. 2020, pp. 159-67, https://publisher.uthm.edu.my/ojs/index.php/ijie/article/view/6762.