Wan Rasidah Kadir, Aminuddin Mohamad, Ahmad Sahali Mardi, and Zaharah Abd. Rahman. 1997. “ROTAN MANAU INTERCROPPED WITH RUBBER: RATE OF ROOT GROWTH BETWEEN THREE AND FOUR YEARS AFTER PLANTING”. Journal of Tropical Forest Science (JTFS) 10 (1):86-93. https://jtfs.frim.gov.my/jtfs/article/view/1593.