Kabir, Md Humayun, Umme Ruman, Sharmin Alam, Shamima Islam, Jakia Sultana, and Md Monirul Islam. “Approximate Shortest Distance and Direction Between Two Places on the Spherical Earth and the Oblate Spherical Earth”. GUB Journal of Science and Engineering 8, no. 1 (November 16, 2022): 49–56. Accessed July 17, 2024. https://banglajol.info/index.php/GUBJSE/article/view/62332.