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V. A. Barchevskii, G. I. Lashkov, and V. A. Tsekhomskii, Photochromism and Its Applications [in Russian], Khimiya, Moscow (1977), p. 280.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 12, pp. 1700–1701, December, 1990.
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Luk'yanov, B.S., Nivorozhkin, L.I., Minkin, V.I. et al. New indoline spiropyrans with π-acceptor substituents in the 8′ position. Chem Heterocycl Compd 26, 1416–1417 (1990). https://doi.org/10.1007/BF00473984
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DOI: https://doi.org/10.1007/BF00473984