Não informado. (1976). Journal of the Rubber Research Institute of Sri Lanka. Rubber Research Institute of Sri Lanka.
Citace podle Chicago (17th ed.)Não informado. Journal of the Rubber Research Institute of Sri Lanka. Agalawatta, Sri Lanka: Rubber Research Institute of Sri Lanka, 1976.
Citace podle MLA (8th ed.)Não informado. Journal of the Rubber Research Institute of Sri Lanka. Rubber Research Institute of Sri Lanka, 1976.
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