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Wenthold, P.G.; Hu, J.; Squire, R.R., Regioselective synthesis of biradical negative ions in the gas phase. Generation of trimethylenemethane, m-benzyne, and p-benzyne anions, J. Am. Chem. Soc., 1994, 116, 15, 6961, https://doi.org/10.1021/ja00094a071 . [all data]