Muhammad, A., and A. S. Muntohar. “Uses Of Lime -Rice Husk Ash And Plastic Fibers As Mixtures-Material In High-Plasticity Clayey Subgrade: A Preliminary Study”. Semesta Teknika, vol. 10, no. 2, Mar. 2016, pp. 145-54, doi:10.18196/st.v10i2.841.