Quantitative Determination of Cycloartane and Flavonoid Glycosides from Sutherlandia frutescens by UPLC-UV, UPLC-ELSD Methods and Confirmation by UPLC-MS - Avula, B; Wang, YH; Smillie, TJ; Fu, X; Li, XC; Mabusela, W; Syce, J; Johnson, Q; Folk, W; Khan, IA (Planta Medica, 2009)