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Van Gemert, B. (2002). Benzo and Naphthopyrans (Chromenes). In: Crano, J.C., Guglielmetti, R.J. (eds) Organic Photochromic and Thermochromic Compounds. Topics in Applied Chemistry. Springer, Boston, MA. https://doi.org/10.1007/0-306-46911-1_4
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