Rossouw, S.D.; Wilken-Jorden, T.J.; Union of South Africa. Dept. of Agriculture; Du Toit, P.J.
(Union of South Africa : Dept. of Agriculture, 1934)
It has been shown that the Sullivan reaction as a quantitative colorimetric method for the determination of cystine can be
considerably improved by better regulation of the conditions necessary
for optimum maximum colour ...