Quoc Sinh Nguyen, Chi Bao Nguyen, Thanh Long Le, Sy Vuong Ho, Thi Diem Huong Nguyen, Van Quoc Bao Vo, and Van Toan Nguyen. “Effects of Anaerobic Fermentation in a Nitrogen Atmosphere on Bioactive Compound Content in Vietnamese GABA Tea”. Vietnam Journal of Science, Technology and Engineering, vol. 60, no. 3, Sept. 2018, pp. 37-41, doi:10.31276/VJSTE.60(3).37.