Asbur, Y., Y. Purwaningrum, M. S. Rahayu, D. Kusbiantoro, and K. Khairunnisyah. “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, doi:10.22302/iopri.jur.jpks.v30i2.184.