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Hoang Thuy Duong, Nguyen Kim Thanh Kieu and Ngo Hong Loan, Phan Thi Kim Ngan, Lam Hoang Anh Thu, Pham Tien Dung, Ngo Vo Ke Thanh, Nguyen Huu Tuyen* 2022. Evaluation of bioactivities of ultrasound-assisted extraction of betel leaves (Piper betle L.). Version B of Vietnam Journal of Science and Technology. 64, 3 (Mar. 2022). DOI:https://doi.org/10.31276/VJST.64(3).37-42.