M Suffian, AL Mohd Yusouf, WS Hashim, and R Rafeadah. 2015. “OPTIMUM SLOPE OF LOAD–DEFLECTION CURVE FOR BENDING YOUNG’S MODULUS DERIVATION”. Journal of Tropical Forest Science (JTFS) 27 (4):527-34. https://jtfs.frim.gov.my/jtfs/article/view/965.