Zi Yan, Y., Li, X.-G., Jin, X.-J., Kyoung Kim, Y., Romij Uddin, M., Hoon Kim, H., … Un Park, S. (2013). Mineral Contents in the Roots of Blue and White Flowered Platycodon grandiflorum (Jacq.) A. D.C. from China and Korea. Asian Journal of Chemistry, 25(13), 7103–7105. https://doi.org/10.14233/ajchem.2013.14452