Response surface optimization of ultrasonic assisted extraction of flavonoids from Brucea javanicaAiping Fei, Junyu Jiang, Yong Wang, Zhigang Fang, Yingxue Teng and Xiaoliang HaoMATEC Web Conf., 238 (2018) 04005DOI: https://doi.org/10.1051/matecconf/201823804005