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Keszthelyi, T.; Wilbrandt, R.; Bally, T.; Roulin, J.-L., Radical Cation of 1,3-Butadiene: Resonance Raman Spectrum of Deuterated Derivatives and Improved Force Field, J. Phys. Chem., 1996, 100, 42, 16850, https://doi.org/10.1021/jp961839x . [all data]