Rahayu, Murni Sari, et al. “Application of Plant Growth Regulator and Oleochemicals to Increase Yield and Accelerate Bark Renewable of Quick Starter PB 260”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 30, no. 3, Nov. 2016, pp. 300-7, https://www.gssrr.org/JournalOfBasicAndApplied/article/view/6486.