(1)
Phung, L. H.; Tran, T. K.; Nguyen, T. C.; Do, H. Q.; Phan, T. T.; Vu, H. S.; Nguyen, T. H. Optimization Research into the Ultrasonic-Assisted Extraction to Separate Polyphenol from Green Tea Waste. ASEAN J. Chem. Eng. 2012, 12, 52-60.