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Zengin, V.; Persson, B.J.; Strong, K.M.; Continetti, R.E., Study of the Low-lying Electronic States of CCO by Photoelectron Spectroscopy of CCO- and ab initio calculations., J. Chem. Phys., 1996, 105, 22, 9740, https://doi.org/10.1063/1.473000 . [all data]