HR Naji, ES Bakar, MH Sahri, M Soltani, H Abdul Hamid, and SE Ebadi. “VARIATION IN MECHANICAL PROPERTIES OF TWO RUBBERWOOD CLONES IN RELATION TO PLANTING DENSITY”. Journal of Tropical Forest Science (JTFS), vol. 26, no. 4, Oct. 2014, pp. 503-12, https://jtfs.frim.gov.my/jtfs/article/view/346.