Maja Shishovska, Zorica Arsova-Sarafinovska, and Shaban Memeti. “A Simple Method for Determination of Protodioscin in Tribulus Terrestris L. And Pharmaceuticals by High-Performance Liquid Chromatography Using Diode-Array Detection”. Journal of Chemical Engineering Research Updates, vol. 2, no. 1, Apr. 2015, pp. 12-21, doi:10.15377/2409-983X.2015.02.01.2.