“Comparison of Vertical Accuracy of Open-Source Global Digital Elevation Models: A Case Study of Adama City, Ethiopia” (2021) Turkish Journal of Computer and Mathematics Education (TURCOMAT), 12(4), pp. 1731–1744. Available at: https://www.turcomat.org/index.php/turkbilmat/article/view/1437 (Accessed: 8 June 2026).