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An electron spin resonance study of the superoxide radical anion in polycrystalline magnesium oxide and titanium dioxide powders
Angelo Amorelli, Jeffrey C. Evans and Christopher C. Rowlands
J. Chem. Soc., Faraday Trans. 1, 1988, 84, 1723-1728
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http://dx.doi.org/10.1039/F19888401723