@article {8,
	title = {Anthraquinones from the roots of Knoxia valerianoides},
	journal = {Journal of Asian natural products research},
	volume = {13},
	year = {2011},
	pages = {1023{\textendash}1029},
	author = {Zhao, Feng and Wang, Su-Juan and Lin, Sheng and Zhu, Cheng-Gen and Yuan, Shao-Peng and Ding, Xiao-Yu and Yue, Zheng-Gang and Yu, Yang and Liu, Bo and Wu, Xiu-Li and others}
}
