G. GAVINO PINNA, M. LUISA GANADU, G. CRISPONI, and V. NlRRCHI, “Assay of Ascorbic Acid in Plants Tissues, I: 1H and 13C NMR Study of the Complex between Cu(I) and 2,2’.Biquinohne”., ajc, vol. 6, no. 2, pp. 413–419, Jun. 2010.