1. Derivative spectrophotometric determination of caffeine in some beverages;Alpdogan;Turkish Journal of Chemistry,2002
2. Determinação de cafeína em bebidas através de cromatografia líquida de alta eficiência (CLAE);Andrade;Química Nova,1995
3. Five years of dispersive liquid–liquid microextraction;Andruch;Applied Spectroscopy Reviews,2013
4. Liquid phase microextraction applications in food analysis;Asensio-Ramos;Journal of Chromatography A,2011
5. Official and tentative method of analysis;Association of Official Agriculture Chemists (AOAC),1945