4Maria Garcia Alonso, Sonia de Pascula Teresa, Celestion Santos Buelga and Julian C. Rivas Gonzalo, [J] Evaluation of the antioxidant properties of fruits, FC, 2004,84:13-18.
5Singleton VL, Rossi JA. [J] Colorimertry of total phenolies with phosphomolybdic-phosphotungstic acid reagents. Am J Eol Vitic 1965, 32:58-63.