Nguyen, H., Huong, T., Minh, D., Loan, H. and Le, T. 2021. Application of response surface methodology to optimize the ultrasound-assisted flavonoid-rich extraction of fish mint (Houttuynia cordata Thunb.). Science and Technology Development Journal. 24, 3 (Aug. 2021), 1994-2003. DOI:https://doi.org/https://doi.org/10.32508/stdj.v24i3.2535.