R Oum Lissouck, R Pommier, D Breysse, LM Ayina Ohandja, and R Dong A Mansié. “CLUSTERING FOR PRESERVATION OF ENDANGERED TIMBER SPECIES FROM THE CONGO BASIN FOREST”. Journal of Tropical Forest Science (JTFS), vol. 28, no. 1, Jan. 2016, pp. 4-20, https://jtfs.frim.gov.my/jtfs/article/view/537.