“Growth Evaluation of Asystasia Gangetica (L.) T. Anderson As a Cover Cover in Mature Oil Palm Plantations on Different Plant Spacing and Types of Stem Cuttings)”. Jurnal Penelitian Kelapa Sawit, vol. 30, no. 2, Aug. 2022, pp. 71-82, https://doi.org/10.22302/iopri.jur.jpks.v30i2.184.