Y. Maruyama, Y. Matsumoto, Y. Morikawa, L.H.Ang, and S.K Yap. “LEAF WATER RELATIONS OF SOME DIPTEROCARPS”. Journal of Tropical Forest Science (JTFS), vol. 10, no. 2, Dec. 1997, pp. 249-55, https://jtfs.frim.gov.my/jtfs/article/view/1610.