Effendi, Z., I. U. P. Rangkuti, and M. I. Muhtadawan. “Application of Boiler Fly Ash for Oil Palm Kernel Separation in Claybath”. Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering), vol. 11, no. 4, Dec. 2022, pp. 542-8, doi:10.23960/jtep-l.v11i4.542-548.