J. J. Boon, K. Keune, J. van der Weerd, M. Geldof, and J. van Asperen de Boer, “Imaging Microspectroscopic, Secondary Ion Mass Spectrometric and Electron Microscopic Studies on Discoloured and Partially Discoloured Smalt in Cross-sections of 16th Century Paintings”, Chimia, vol. 55, no. 11, p. 952, Nov. 2001, doi: 10.2533/chimia.2001.952.