1. Alexander S, Mochtar IB, Main W (2016) Identification of the existence and change of cracks in the slopes through tomographic resistivity and induced polarization testing as proof of hypothesis the concept of crack soil. Ph.D. Research proposal. Civil Engineering, Sepuluh Nopember Institute of Technology (ITS), Indonesia (unpublished)
2. Alexander S, Mochtar IB, Main W (2017) The measurements of water intrusion through cracks propagation inside slopes to explain the cause of slope failure-case study of embankment in the Sanggu-Buntok Airport, Central Kalimantan, Indonesia. Electron J Geotech Eng (EJGE) 22(14):5347–5362
3. Amalia D, Mochtar IB, Mochtar NE (2017) Penerapan konsep baru cracked soils pada penanggulangan kelongsoran lereng [Application of the new concept of cracked soils on slope eradication management], Industrial Research Workshop and National Seminar 9:50–62
4. Amalia D, Mochtar IB, Mochtar NE (2019) Application of digital image technology for determining geometry, stratigraphy, and position of cracks inside earth slope. J Geomate 17(63):297–306
5. Bishop AW (1955) The use of the slip circle in the stability analysis of slopes. Geotechnique 5:7–17