“ANGLE OF SLOPE AND SLOPE SAFETY FACTOR RELATIONSHIP IN GENDOL RIVER, SOUTHERN SLOPE OF MERAPI VOLCANO, YOGYAKARTA”, INTERNATIONAL JOURNAL OF GEOMATE, vol. 17, no. 64, pp. 93–99, Dec. 2019, Accessed: Sep. 05, 2026. [Online]. Available: https://geomatejournal.com/geomate/article/view/392