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3. (c) In Organic photochromic and Thermochromic compounds, vol. 1, (eds). Plenum Press: New York, 1999;
4. (d) . (eds). Photochromic and Thermochromic Compounds, vols I and II, Kluwer Academic Publishers, Plenum Press: New York; 1999;
5. (e) Photochromism. Wiley-Interscience: New York, 1971.