Phung, L. H., Tran, T. K., Nguyen, T. C., Do, H. Q., Phan, T. T., Vu, H. S., & Nguyen, T. H. (2012). Optimization Research into the Ultrasonic-assisted Extraction to Separate Polyphenol from Green Tea Waste. ASEAN Journal of Chemical Engineering, 12(2), 52-60. Retrieved from https://journal.ugm.ac.id/v3/AJChE/article/view/8132