“CHARACTERIZATION OF OIL DURING FRUIT RIPENING OF OIL PALM (Elaeis guineensis Jacq) VARIETY D X P SIMALUNGUN”, J. Penelitian Kelapa Sawit, vol. 25, no. 2, pp. 59–70, Aug. 2017, doi: 10.22302/iopri.jur.jpks.v25i2.25.