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Guo, J.C.; Hou, G.L.; Li, S.D.; Wang, X.B., Probing the Low-Lying Electronic States of Cyclobutanetetraone (C4O4) and Its Radical Anion: A Low-Temperature Anion Photoelectron Spectroscopic Approach, J. Phys. Chem. Lett., 2012, 3, 3, 304-308, https://doi.org/10.1021/jz201593z . [all data]