1. Photochromism;Dorion,1970
2. Photochromism;Brown,1971
3. Organic Photochromes;El’tsov,1990
4. R.E. Crano, J.C. Guglielmetti, Organic Photochromic and Thermochromic Compounds, Plenum Press, New York.
5. Fluorescence Modulation with Photochromic Switches