M. A. C. . Ligoh, E. S. . Laira, H. O. . Wensen, T. T. V. . Pangow, and N. P. . Sompie, “Design and Development of a Prototype Early Warning System for Landslide Detection Based on Mechanical Movement with an Automatic Ground Displacement Detector”, IJ, vol. 8, no. 3, pp. 229–239, Aug. 2026.