Tran, Trung Kien, Lan Huong Phung, Hoai Nga le, Thi Thu Huyen Nguyen, Xuan Son Nghiem, and Van Thiem Pham. 2012. “A Dynamic Model for Ultrasonic – Assisted Extraction of Bio-Active Compounds from Natural Products”. ASEAN Journal of Chemical Engineering 12 (2), 35-42. https://journal.ugm.ac.id/v3/AJChE/article/view/8130.