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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 3, pp. 425–426, March, 1971.
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Gordin, M.B., Gal'bershtam, M.A. New method for the determination of the extinction coefficient of the photocolored form of spiropyrans. Chem Heterocycl Compd 7, 396–397 (1971). https://doi.org/10.1007/BF00944435
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DOI: https://doi.org/10.1007/BF00944435