Yang, R. (2014) “Optimization of Ultrasonic-Assisted Extraction of Flavonoids from Fenugreek Using Response Surface Methodology and High-Performance Liquid Chromatography-Diode Array Detector Coupled with Mass Spectrometry Analysis”, Asian Journal of Chemistry, 26(15), pp. 4830–4834. doi: 10.14233/ajchem.2014.16256.