Bangshidhar Goswami, and Jaydev Banerjee, Tarun Kumar Goswami, Deep Sen. “Global Positioning System (GPS) – A Study”. Journal of Power Electronics and Devices 7, no. 3 (October 20, 2021): 17–22. Accessed April 4, 2025. http://matjournals.co.in/index.php/JOPED/article/view/3827.