Wan Rasidah Kadir, Aminuddin Mohamad, Ahmad Sahali Mardi, and Zaharah Abd. Rahman. “ROTAN MANAU INTERCROPPED WITH RUBBER: RATE OF ROOT GROWTH BETWEEN THREE AND FOUR YEARS AFTER PLANTING”. Journal of Tropical Forest Science (JTFS), vol. 10, no. 1, Sept. 1997, pp. 86-93, https://jtfs.frim.gov.my/jtfs/article/view/1593.