N. S. Dudley, and J. H. Fownes. “PRELIMINARY BIOMASS EQUATIONS FOR EIGHT SPECIES OF FAST-GROWING TROPICAL TREES”. Journal of Tropical Forest Science (JTFS), vol. 5, no. 1, Sept. 1992, pp. 68-73, https://jtfs.frim.gov.my/jtfs/article/view/1936.