Sompotan, A. F., Pasasa, L. A. and Sule, R. (2013) “Comparing Models GRM, Refraction Tomography and Neural Network to Analyze Shallow Landslide”, Journal of Engineering and Technological Sciences, 43(3), pp. 161-172. doi: 10.5614/itbj.eng.sci.2011.43.3.1.