K. Niiyama, K. Abd. Rahman, S. Iida, K. Kimura, R. Azizi and S. Appanah, “SPATIAL PATTERNS OF COMMON TREE SPECIES RELATING TO TOPOGRAPHY, CANOPY GAPS AND UNDERSTOREY VEGETATION IN A HILL DIPTEROCARP FOREST AT SEMANGKOK FOREST RESERVE, PENINSULAR MALAYSIA”, JTFS, vol. 11, no. 4, pp. 731–745, Oct. 1999.