Sainoi, T., S. Sdoodee, R. Lacote, and E. Gohet. “Low Frequency Tapping Systems Applied to Young-Tapped Trees of Hevea Brasiliensis (Willd. Ex A. Juss.) Müll. Arg. In Southern Thailand”. Agriculture and Natural Resources, vol. 51, no. 4, Aug. 2017, pp. 268-72, https://li01.tci-thaijo.org/index.php/anres/article/view/239985.