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Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 38, No. 4, pp. 577–581, April, 1983.
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Khamchukov, Y.D., Gradyushko, A.T., Marevtsev, V.S. et al. Polarization of the phosphorescence of the closed form of 1,3,3-trimethyl-6′-nitrospiro(indoline-2,2′-[2H-1] benzopyran). J Appl Spectrosc 38, 417–421 (1983). https://doi.org/10.1007/BF00662351
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DOI: https://doi.org/10.1007/BF00662351