A rapid and sensitive UFLC-MS/MS method for the simultaneous determination of gentiopicroside and swertiamarin in rat plasma and its application in pharmacokinetics - Feng, B; Zhu, H; Guan, J; Zhao, L; Gu, J; Yin, L; Fawcett, J P; Liu, W (J Pharm Pharmacol, 2014)