Costrada, Aldo Novaznursyah, et al. “Characterization of Multiple-Bend Optical Fiber Extensometer Design for Landslide Sensor”. JURNAL ILMU FISIKA | UNIVERSITAS ANDALAS, vol. 13, no. 1, Feb. 2021, pp. 1-7, doi:10.25077/jif.13.1.1-7.2021.