4Zoran S M,Nedeljko T M,Svetlana R J,et al.HPLC,UV-vis and NMR spectroscopic and DFT characterization of purpurin isolated from Rubia tinctorum L..Hemijska Industrija,2013,67(1):77-88.
5Xu-Jie Zhang,Li-Juan Liu,Ting-Ting Song,et aLAn approach based on antioxidant fingerprint-efficacy relationship and TLC bioantography assay to quality evaluation of Rubia cordifolia from various sources.Journal of Natural Medicines,2014,68(2):448-454.