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Segre De Giambiagi, M., Giambiagi, M. & Freitas Castro, A. Excited states and pairing relations in certain conjugated systems. Lett. Nuovo Cimento 33, 327–330 (1982). https://doi.org/10.1007/BF02725557
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DOI: https://doi.org/10.1007/BF02725557