5Al-Widyan M h AI-Shyoukh A O. Experimental evaluation of the tmnsesterification of waste palm oil into biodiesel[J]. Bioresource Technology, 2003, 85(3): 253-6.
6Goodacre R, Vaidyanathan S, Bianchi G, Kell DB (2002) Metabolic profiling using direct infusion electrospray ionisation mass spectrometry for the characterisation of olive oils. Analyst, 2002, 127: 1457-1462.