Hann, Michael, Toya Nath Baral, and Rabin Kaji Sharma. “A Study on Digital Orthophoto Generation of Mount Everest Region”. Journal on Geoinformatics, Nepal 2, no. 1 (May 28, 2003): 35–43. Accessed December 8, 2025. https://www.nepjol.info/index.php/NJG/article/view/51455.