1. 1. A. Zebala, T. Learner, R. Rivenc, Sam Francis: Catalogue Raisonné of Canvas and Panel Paintings, 1946–1994, DVD II (University of California Press, Sam Francis Foundation, Berkeley, 2011)
2. 2. S. Staniforth, Stud. Conserv. 30, 101 (1985)
3. 3. R.S Berns, M. Mohammadi, M. Nezamabadi, L.A. Taplin, ICOM 2005 Conference (ICOM, 2005) (2005)
4. 4. W. Herbst, K. Hunger, G. Wilker, Industrial Organic Pigments: Production, Properties, Applications, 3rd edn. (Wiley-VCH, Weinheim, 2004)
5. 5. S.Q. Lomax, T. Learner, J. Am. Inst. Conserv. 45(2), 107 (2006)