Landform classification based on topographic position Index: (A case study in Ulaanbaatar city). Mong. J. Geogr. Geoecol. [Internet]. 2022 Dec. 29 [cited 2026 Jun. 26];59(43):218-26. Available from: https://www.mongoliajol.info/index.php/MJGG/article/view/2530