Thanh, D., N. Thanh, and N. Thang. “Toxicological and Melanin Synthesis Effects of Polygonum Multiflorum Root Extracts on Zebrafish Embryos and Human Melanocytes”. Biomedical Research and Therapy, Vol. 3, no. 09, Sept. 2016, pp. 808-1, http://bmrat.biomedpress.org/index.php/BMRAT/article/view/4.