The compressive strength improvement on softsoil subgrade with Quicklime stabilization, activated Gum Rosin and Iron OxideSofwan, Lawalenna Samang, Tri Harianto and Achmad Bakri MuhidinMATEC Web Conf., 181 (2018) 01002DOI: https://doi.org/10.1051/matecconf/201818101002