Arabov O.Z. “IMPROVING THE ACCURACY OF THE OPEN ACCESS DIGITAL ELEVATION MODELS USING GNSS: CASE FERGANA VALLEY”. EPRA International Journal of Economic Growth and Environmental Issues(EGEI), vol. 10, no. 4, Apr. 2022, pp. 1-5, https://eprajournals.net/index.php/EGEI/article/view/315.