Malsriwijaya, B., S. M. Bernas, D. Budianta, and M. Said. “Application of Various Concentrations of Liquid Waste from Oil Palm Mill on the Growth of Oil Palm Plant (Elaeis Guinensis, Jacq)”. KnE Life Sciences, Vol. 2, no. 6, Nov. 2017, pp. 228-37, doi:10.18502/kls.v2i6.1044.