Siswanto, and Purwadi. “Identification and Mapping of Critical Land Level in Probolinggo District Using Geographic Information System (GIS) Techniques (Case Study: Sumberasih, Wonokerto Sub-District, Bantaran, Maron, Krejengan, Tegal Siwalan and Pakuniran)”. Nusantara Science and Technology Proceedings, May 2021, pp. 434-47, https://doi.org/10.11594/nstp.2021.0965.