Alamsyah, Andi, et al. “Application of Seismic Refraction Tomography in Determining the Soil Hardness Level in IKN Nusantara Area”. JURNAL GEOCELEBES, vol. 8, no. 1, Apr. 2024, pp. 62 – 70, doi:10.20956/geocelebes.v8i1.32159.