1. Amaro A, Reed D, Tome M, Themido I. 1998. Modelling dominant height growth: Eucalyptus plantations in Portugal. Forest Science, 44: 37–46.
2. Baulkwill WJ. 1989. The history of natural rubber production. In: C.C. Webster and W.J. Baulkwill (eds), Rubber. UK: Longman Scientific and Technical, pp. 1–56.
3. Caillet GM, Smith WD, Mollet HF, Goldman KJ. 2006. Age and growth studies of chondrichthyan fishes: the need for consitency in terminology, verification, validation and growth function fitting. Environmental Biology of Fishes, 77: 211–228.
4. Causton DR, Venus JC. 1981. The biometry of plant growth. Edward Arnold, UK.
5. Chandrasekhar TR, Alice J, Varghese YA, Saraswathyamma CK, Vijayakumar KR. 2005. Girth growth of rubber (Hevea brasiliensis) trees during the immature phase. Journal of Tropical Forest Science, 17: 399–415.