Effects of licorice processing conditions on content and proportion of 18α-glycyrrhizic acid and 18β-glycyrrhizic acid
ZHAO Yanyan，LI Yang，LIU Liyan，LIU Yafei， SUN Dong，GAO Bo
Journal of Hebei University (Natural Science Edition) . 2015, (2): 138 -146 .  DOI: 10.3969/j.issn.1000-1565.2015.02.006