Yves Achille Amougou Ndi, et al. “Wood Density Variations of Tropical Trees Differing in Shade-Tolerance and Leaf Phenology of the Congo Basin”. Global Journal of Science Frontier Research, vol. 23, no. H2, June 2023, pp. 65-76, https://journalofscience.org/index.php/GJSFR/article/view/102656.