Wang, L., et al. “Simultaneous Determination of Ginsenosides, Ginsenosides, Notoginsenosides and Panaxtrol Saponin of Panax Notoginseng by Near Infrared Spectroscopy”. Asian Journal of Chemistry, vol. 27, no. 2, Jan. 2015, pp. 555-7, doi:10.14233/ajchem.2015.17033.