A. M. Hapsari, D. Sisinggih, A. P. Hendrawan, and S. Wahyuni, “Identification of Physical and Mineralogical Properties of Riverbank Material at Sand Mining Landslide Sites of Kali Putih River, Blitar”, U Karst, vol. 5, no. 1, pp. 33–48, Apr. 2021.