Zhou, J., and F. Qu. “ANALYSIS OF THE EXTRACTS OF ISATIS TINCTORIA BY NEW ANALYTICAL APPROACHES OF HPLC, MS AND NMR”. African Journal of Traditional, Complementary and Alternative Medicines, vol. 8, no. 5S, Apr. 2011, pp. 33-45, https://journals.athmsi.org/index.php/ajtcam/article/view/1307.