E. Munyanziza, Th.W. Kuyper, and R.A.A. Oldeman. “IRON DEFICIENCY IN <em>PTEROCARPUS</em> <em>ANGOLENSIS</Em> NURSERY SEEDLINGS: SYMPTOMS AND CURE”. Journal of Tropical Forest Science (JTFS), vol. 10, no. 3, Mar. 1998, pp. 292-6, https://jtfs.frim.gov.my/jtfs/article/view/1617.