XX.—Researches on the relation between the molecular structure of carbon compounds and their absorption spectra. Part VIII. A study of coloured substances and dyes
W. N. Hartley. "XX.—Researches on the relation between the molecular structure of carbon compounds and their absorption spectra. Part VIII. A study of coloured substances and dyes." Journal of the Chemical Society Transactions 51.0 (1887) 152-202