Nguyet, Vu Thi, et al. “Evaluating Cytotoxic Effect of the Extracted Compounds from Ehretia Asperula Zoll. & Mor Stem on Several Cancer Cell Lines”. Academia Journal of Biology, vol. 40, no. 2, Nov. 2018, pp. 145-52, doi:10.15625/0866-7160/v40n2.12955.