3.
Geng H., Wang J., Cai A., Zhou H., Dong Q., Xue Y., Ma X., Liu S.: Dynamic research of density on Platycodon grandiflorum dry material accumulation and platycodin D content in Platycodon grandiflorum. Zhongguo Zhong Yao Za Zhi, 2009, 31 (1): 22-5.