F da Silva, N Higuchi, CC Nascimento, JLM Matos, EVCM de Paula, and J dos Santos. 2014. “NONDESTRUCTIVE EVALUATION OF HARDNESS IN TROPICAL WOOD”. Journal of Tropical Forest Science (JTFS) 26 (1):69-74. https://jtfs.frim.gov.my/jtfs/article/view/244.