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Hajgato, B.; Nguyen, H.M.T.; Veszpremi, T.; Nguyen, M.T., Triplet-singlet energy gaps in iodo-carbenes (I-C-X): Remarkable discrepancy between theory and experiment, Phys. Chem. Chem. Phys., 2000, 2, 22, 5041-5045, https://doi.org/10.1039/b005208f . [all data]