Roberta Re, Nicoletta Pellegrini, Anna Proteggente, Ananth Pannala, Min Yang, Catherine Rice-Evans,
Antioxidant activity applying an improved ABTS radical cation decolorization assay. Free Radical Biology and Medicine. ,vol. 26, pp. 1231- 1237 ,(1999) ,
10.1016/S0891-5849(98)00315-3